two identical large falt conducting plates are held parallel to each other. The

Question

two identical large falt conducting plates are held parallel to each other. The upper plate has a charge of +Q and the lower has a charfe of -Q. Consider points A , B, C , D , E where B is on the upper plate, D is on the lower one, C is in between , A is above the upper and E is below the lower. I have to rank the points from the greatest electric field to the least.

I can see that B and D are 0 because they are on the conducter. But the professor said A and E are also 0 why ? And how do we proceed for C ? Thanks.

Explanation / Answer

take a guassian suface including the two plates Clearly A and E are outside the surface.So the potential is 0 since the total charge due to the guassian surface is 0. For C follow the traditional method.

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