Why don't the electric field vectors cancel each other out in a non-conducting infinite plane sheet?Why is...
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Why don't the electric field vectors cancel each other out in a non-conducting infinite plane sheet?
Why is the electric field of an infinite insulated plane of charge perpendicular to the plane?Difference between $E$ field configuration, sheet of charge: infinite sheet of charge, conducting vs. non-conductingElectric field uniform circle $R$ direction cancel outWhy don't magnetic and electric field lines collide?Why does the electric field in a dipole cancel out at distances much larger than the separation of the two charges forming a dipole ($r gg 2a$)?Why does the electric field of an infinite line depend on the distance, but not on an infinite plane?Infinite charged sheet kicked into motion - Electric field direction?Electric field below conducting planeElectric field due to uniformly charged infinite plane sheetElectric field of infinite sheet
$begingroup$
Why do these vectors not cancel each other out in spite of their being in the opposite directions?
electrostatics electric-fields vectors gauss-law
New contributor
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show 2 more comments
$begingroup$
Why do these vectors not cancel each other out in spite of their being in the opposite directions?
electrostatics electric-fields vectors gauss-law
New contributor
$endgroup$
$begingroup$
Hi Jay. Can you clarify exactly what you are asking? Do you mean an infinite charged sheet? If so, where do you think the vectors will cancel. At the mid plane of the sheet? If you would like to draw a diagram and upload it to an image hosting site we can insert the diagram into your question to help clarify it.
$endgroup$
– John Rennie
18 hours ago
$begingroup$
As shown in the image above the electric field vectors are going in opposite directions above and below the plane.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
The upwards field exists only above the sheet and the downwards field exists only below the sheet. The only place where both the two fields exist is right in the centre of the sheet, and in that plane they do cancel. Everywhere else they can't cancel because they don't overlap.
$endgroup$
– John Rennie
17 hours ago
$begingroup$
Consider it being point charges smeared across the plate. The field lines are supposedly propagating off the same set of charged particles in all directions, and the approximate resultant vector direction is the upward and downward. Try drawing a set of positive point charges horizontally and then resolve the approximate directions of their net combined field effect.
$endgroup$
– TechDroid
17 hours ago
2
$begingroup$
If you want to quote a part of your text, please type it out rather than posting a picture. The relevant information won't show up if other people search for a similar question if it is in a picture.
$endgroup$
– Aaron Stevens
17 hours ago
|
show 2 more comments
$begingroup$
Why do these vectors not cancel each other out in spite of their being in the opposite directions?
electrostatics electric-fields vectors gauss-law
New contributor
$endgroup$
Why do these vectors not cancel each other out in spite of their being in the opposite directions?
electrostatics electric-fields vectors gauss-law
electrostatics electric-fields vectors gauss-law
New contributor
New contributor
edited 17 hours ago
Jay Sen
New contributor
asked 18 hours ago
Jay SenJay Sen
62
62
New contributor
New contributor
$begingroup$
Hi Jay. Can you clarify exactly what you are asking? Do you mean an infinite charged sheet? If so, where do you think the vectors will cancel. At the mid plane of the sheet? If you would like to draw a diagram and upload it to an image hosting site we can insert the diagram into your question to help clarify it.
$endgroup$
– John Rennie
18 hours ago
$begingroup$
As shown in the image above the electric field vectors are going in opposite directions above and below the plane.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
The upwards field exists only above the sheet and the downwards field exists only below the sheet. The only place where both the two fields exist is right in the centre of the sheet, and in that plane they do cancel. Everywhere else they can't cancel because they don't overlap.
$endgroup$
– John Rennie
17 hours ago
$begingroup$
Consider it being point charges smeared across the plate. The field lines are supposedly propagating off the same set of charged particles in all directions, and the approximate resultant vector direction is the upward and downward. Try drawing a set of positive point charges horizontally and then resolve the approximate directions of their net combined field effect.
$endgroup$
– TechDroid
17 hours ago
2
$begingroup$
If you want to quote a part of your text, please type it out rather than posting a picture. The relevant information won't show up if other people search for a similar question if it is in a picture.
$endgroup$
– Aaron Stevens
17 hours ago
|
show 2 more comments
$begingroup$
Hi Jay. Can you clarify exactly what you are asking? Do you mean an infinite charged sheet? If so, where do you think the vectors will cancel. At the mid plane of the sheet? If you would like to draw a diagram and upload it to an image hosting site we can insert the diagram into your question to help clarify it.
$endgroup$
– John Rennie
18 hours ago
$begingroup$
As shown in the image above the electric field vectors are going in opposite directions above and below the plane.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
The upwards field exists only above the sheet and the downwards field exists only below the sheet. The only place where both the two fields exist is right in the centre of the sheet, and in that plane they do cancel. Everywhere else they can't cancel because they don't overlap.
$endgroup$
– John Rennie
17 hours ago
$begingroup$
Consider it being point charges smeared across the plate. The field lines are supposedly propagating off the same set of charged particles in all directions, and the approximate resultant vector direction is the upward and downward. Try drawing a set of positive point charges horizontally and then resolve the approximate directions of their net combined field effect.
$endgroup$
– TechDroid
17 hours ago
2
$begingroup$
If you want to quote a part of your text, please type it out rather than posting a picture. The relevant information won't show up if other people search for a similar question if it is in a picture.
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
Hi Jay. Can you clarify exactly what you are asking? Do you mean an infinite charged sheet? If so, where do you think the vectors will cancel. At the mid plane of the sheet? If you would like to draw a diagram and upload it to an image hosting site we can insert the diagram into your question to help clarify it.
$endgroup$
– John Rennie
18 hours ago
$begingroup$
Hi Jay. Can you clarify exactly what you are asking? Do you mean an infinite charged sheet? If so, where do you think the vectors will cancel. At the mid plane of the sheet? If you would like to draw a diagram and upload it to an image hosting site we can insert the diagram into your question to help clarify it.
$endgroup$
– John Rennie
18 hours ago
$begingroup$
As shown in the image above the electric field vectors are going in opposite directions above and below the plane.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
As shown in the image above the electric field vectors are going in opposite directions above and below the plane.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
The upwards field exists only above the sheet and the downwards field exists only below the sheet. The only place where both the two fields exist is right in the centre of the sheet, and in that plane they do cancel. Everywhere else they can't cancel because they don't overlap.
$endgroup$
– John Rennie
17 hours ago
$begingroup$
The upwards field exists only above the sheet and the downwards field exists only below the sheet. The only place where both the two fields exist is right in the centre of the sheet, and in that plane they do cancel. Everywhere else they can't cancel because they don't overlap.
$endgroup$
– John Rennie
17 hours ago
$begingroup$
Consider it being point charges smeared across the plate. The field lines are supposedly propagating off the same set of charged particles in all directions, and the approximate resultant vector direction is the upward and downward. Try drawing a set of positive point charges horizontally and then resolve the approximate directions of their net combined field effect.
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Consider it being point charges smeared across the plate. The field lines are supposedly propagating off the same set of charged particles in all directions, and the approximate resultant vector direction is the upward and downward. Try drawing a set of positive point charges horizontally and then resolve the approximate directions of their net combined field effect.
$endgroup$
– TechDroid
17 hours ago
2
2
$begingroup$
If you want to quote a part of your text, please type it out rather than posting a picture. The relevant information won't show up if other people search for a similar question if it is in a picture.
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
If you want to quote a part of your text, please type it out rather than posting a picture. The relevant information won't show up if other people search for a similar question if it is in a picture.
$endgroup$
– Aaron Stevens
17 hours ago
|
show 2 more comments
2 Answers
2
active
oldest
votes
$begingroup$
In order to superimpose two or more electric fields, they must be defined in the same region. In other words
$$mathbf E=mathbf E_1(x_0,y_0)+mathbf E_2(x_0,y_0)$$
for some point in space $(x_0,y_0)$
In your case, $mathbf E_1$ and $mathbf E_2$ exist in different regions of space. Therefore, you can't superimpose them and they don't cancel. It's kind of like asking if I put my car in drive and your put yours in reverse why both of our cars don't just stay still.
Perhaps your confusion lies in thinking that the field vectors in your picture only exist on the sheet. This is not the case. At every point $(x,y,z)$ in space there is an electric field. For $z>0$ the field points upward, for $z<0$ the field points downward. You can't add the upward and downward fields together because they exist in different regions of space.
$endgroup$
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
|
show 4 more comments
$begingroup$
This is a inside look at the atomic scale:
The field effect is radial and the intersecting field effects sort of cancles out. The direction lines are not forces on the plate but the field effect direction from the plate. You only do that sort of vector cancellation if the force vectors are rather on the plate. If another lone floating positively charged particle falls anywhere in this region, those field lines are the direction of force on the charge. We aren't vectorially resolving the field lines, but rather the force effect on another charged body.
$endgroup$
add a comment |
Your Answer
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2 Answers
2
active
oldest
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2 Answers
2
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$begingroup$
In order to superimpose two or more electric fields, they must be defined in the same region. In other words
$$mathbf E=mathbf E_1(x_0,y_0)+mathbf E_2(x_0,y_0)$$
for some point in space $(x_0,y_0)$
In your case, $mathbf E_1$ and $mathbf E_2$ exist in different regions of space. Therefore, you can't superimpose them and they don't cancel. It's kind of like asking if I put my car in drive and your put yours in reverse why both of our cars don't just stay still.
Perhaps your confusion lies in thinking that the field vectors in your picture only exist on the sheet. This is not the case. At every point $(x,y,z)$ in space there is an electric field. For $z>0$ the field points upward, for $z<0$ the field points downward. You can't add the upward and downward fields together because they exist in different regions of space.
$endgroup$
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
|
show 4 more comments
$begingroup$
In order to superimpose two or more electric fields, they must be defined in the same region. In other words
$$mathbf E=mathbf E_1(x_0,y_0)+mathbf E_2(x_0,y_0)$$
for some point in space $(x_0,y_0)$
In your case, $mathbf E_1$ and $mathbf E_2$ exist in different regions of space. Therefore, you can't superimpose them and they don't cancel. It's kind of like asking if I put my car in drive and your put yours in reverse why both of our cars don't just stay still.
Perhaps your confusion lies in thinking that the field vectors in your picture only exist on the sheet. This is not the case. At every point $(x,y,z)$ in space there is an electric field. For $z>0$ the field points upward, for $z<0$ the field points downward. You can't add the upward and downward fields together because they exist in different regions of space.
$endgroup$
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
|
show 4 more comments
$begingroup$
In order to superimpose two or more electric fields, they must be defined in the same region. In other words
$$mathbf E=mathbf E_1(x_0,y_0)+mathbf E_2(x_0,y_0)$$
for some point in space $(x_0,y_0)$
In your case, $mathbf E_1$ and $mathbf E_2$ exist in different regions of space. Therefore, you can't superimpose them and they don't cancel. It's kind of like asking if I put my car in drive and your put yours in reverse why both of our cars don't just stay still.
Perhaps your confusion lies in thinking that the field vectors in your picture only exist on the sheet. This is not the case. At every point $(x,y,z)$ in space there is an electric field. For $z>0$ the field points upward, for $z<0$ the field points downward. You can't add the upward and downward fields together because they exist in different regions of space.
$endgroup$
In order to superimpose two or more electric fields, they must be defined in the same region. In other words
$$mathbf E=mathbf E_1(x_0,y_0)+mathbf E_2(x_0,y_0)$$
for some point in space $(x_0,y_0)$
In your case, $mathbf E_1$ and $mathbf E_2$ exist in different regions of space. Therefore, you can't superimpose them and they don't cancel. It's kind of like asking if I put my car in drive and your put yours in reverse why both of our cars don't just stay still.
Perhaps your confusion lies in thinking that the field vectors in your picture only exist on the sheet. This is not the case. At every point $(x,y,z)$ in space there is an electric field. For $z>0$ the field points upward, for $z<0$ the field points downward. You can't add the upward and downward fields together because they exist in different regions of space.
edited 15 hours ago
answered 17 hours ago
Aaron StevensAaron Stevens
12.2k32147
12.2k32147
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
|
show 4 more comments
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
Then how and why are we adding them up?
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
@JaySen We aren't adding them up. That's what I'm trying to say. The two fields that you say should cancel out exist in different regions of space, so they don't add up and don't cancel
$endgroup$
– Aaron Stevens
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
I think we add them up for getting the total electric field.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
When doing field line vector resolution, we aren't adding the field or field lines itself, but the effect vector direction of the field(s).
$endgroup$
– TechDroid
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
Sorry but i haven't understood this yet.
$endgroup$
– Jay Sen
17 hours ago
|
show 4 more comments
$begingroup$
This is a inside look at the atomic scale:
The field effect is radial and the intersecting field effects sort of cancles out. The direction lines are not forces on the plate but the field effect direction from the plate. You only do that sort of vector cancellation if the force vectors are rather on the plate. If another lone floating positively charged particle falls anywhere in this region, those field lines are the direction of force on the charge. We aren't vectorially resolving the field lines, but rather the force effect on another charged body.
$endgroup$
add a comment |
$begingroup$
This is a inside look at the atomic scale:
The field effect is radial and the intersecting field effects sort of cancles out. The direction lines are not forces on the plate but the field effect direction from the plate. You only do that sort of vector cancellation if the force vectors are rather on the plate. If another lone floating positively charged particle falls anywhere in this region, those field lines are the direction of force on the charge. We aren't vectorially resolving the field lines, but rather the force effect on another charged body.
$endgroup$
add a comment |
$begingroup$
This is a inside look at the atomic scale:
The field effect is radial and the intersecting field effects sort of cancles out. The direction lines are not forces on the plate but the field effect direction from the plate. You only do that sort of vector cancellation if the force vectors are rather on the plate. If another lone floating positively charged particle falls anywhere in this region, those field lines are the direction of force on the charge. We aren't vectorially resolving the field lines, but rather the force effect on another charged body.
$endgroup$
This is a inside look at the atomic scale:
The field effect is radial and the intersecting field effects sort of cancles out. The direction lines are not forces on the plate but the field effect direction from the plate. You only do that sort of vector cancellation if the force vectors are rather on the plate. If another lone floating positively charged particle falls anywhere in this region, those field lines are the direction of force on the charge. We aren't vectorially resolving the field lines, but rather the force effect on another charged body.
edited 17 hours ago
answered 17 hours ago
TechDroidTechDroid
1317
1317
add a comment |
add a comment |
Jay Sen is a new contributor. Be nice, and check out our Code of Conduct.
Jay Sen is a new contributor. Be nice, and check out our Code of Conduct.
Jay Sen is a new contributor. Be nice, and check out our Code of Conduct.
Jay Sen is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
Hi Jay. Can you clarify exactly what you are asking? Do you mean an infinite charged sheet? If so, where do you think the vectors will cancel. At the mid plane of the sheet? If you would like to draw a diagram and upload it to an image hosting site we can insert the diagram into your question to help clarify it.
$endgroup$
– John Rennie
18 hours ago
$begingroup$
As shown in the image above the electric field vectors are going in opposite directions above and below the plane.
$endgroup$
– Jay Sen
17 hours ago
$begingroup$
The upwards field exists only above the sheet and the downwards field exists only below the sheet. The only place where both the two fields exist is right in the centre of the sheet, and in that plane they do cancel. Everywhere else they can't cancel because they don't overlap.
$endgroup$
– John Rennie
17 hours ago
$begingroup$
Consider it being point charges smeared across the plate. The field lines are supposedly propagating off the same set of charged particles in all directions, and the approximate resultant vector direction is the upward and downward. Try drawing a set of positive point charges horizontally and then resolve the approximate directions of their net combined field effect.
$endgroup$
– TechDroid
17 hours ago
2
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– Aaron Stevens
17 hours ago