Assume that charge −q is placed on the top plate, and +q is placed on the bottom plate. What is the magnitude of the electric field E between the plates? Express E in terms of q and other quantities given in the introduction, in addition to ϵ0 and any other constants needed..

Explanation:

Let the area of each plate be A.

From Gauss Law,

Thus, using Gauss law, electric field between the plates is:

probably not if net force is zero

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