The figure below (no figure) shows a side view of 3 large (infinite) plates para

Question

The figure below (no figure) shows a side view of 3 large (infinite) plates parallel to each other. Plates A & B are negatively and positively charged respectively. The direction (not the magnitude) of the electric field is represented by arrows. What is the sign of the charge on plate C? Assume that all charge densities are equal in absolute value. A. positive B. negative C. neutral D. need more information

The description of the figure: C is in the middle. A is on the left and B is on the right. The arrows in the middle point form B to C, from C to A. The Arrow on the left points away from A, and the arrow on the right points away from B.

Explanation / Answer

Since net effect of A and B plates on left of A and right of B is zero. So we can say that to make electric field point away from A towards left of A and away from B towards right of B, we need C to be positively charged and this also satasfy other condition of electric field.

So answer is A :- positive

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