# A uniform electric field is present in the region between infinite parallel plane plates A and B and a uniform electric field is present in

Question

A uniform electric field is present in the region between infinite parallel plane plates A and B and a uniform electric field is present in the region between infinite parallel plane plates B and C. When the plates are vertical, is directed to the right and to the left. The signs of the charges on plates A, B and C may be:_______.
A. — ,–, —
B. + , — , —
C. + , –, +

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1 year 2021-08-31T22:10:54+00:00 1 Answers 283 views 0

the correct answer is C     +, – , +

Explanation:

The electric field for positive charges is outgoing and for negative charges it is directed towards the charge.

Let’s apply this to our case:

On plates A and B the field goes to the right, therefore plate A must be positive

In plates B and C the way it goes to the left, so the field is selected from it, this implies that plate C is positive

therefore plate B must be negative for both cases

when checking the correct answer is C     +, – , +