Question

1. Two large parallel thin metallic plates are placed close to each other. The plates have surface charge densities of opposite signs and magnitude 20 nc. Find the electric field - (i) in the outer region of the plates and (ii) in the region between the plates?

Answer 1

(1) In outer region electric field will be zero as electric field due to positive and negative plate cancel each other.

(2) In between plates E=(sigma/epsilon)

put the values you will get answer