Q 1.24)

Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude 17.0 × 10–22 C /m2

What is E :

(a) In the outer region of the first plate,

(b) In the outer region of the second plate, and

(c) between the plates?


 

Question 1.24

A and B are two parallel plates close to each other.

Charge density of plate A, σ = 17.0 × 10 – 22 C/m 2
charge density of plate B, σ = – 17.0 × 10 – 22 C/m 2

In regions, I and III, electric field E is zero. This is because no charge is enclosed by a gaussian surface covering both of the plates as the total charge on both of the plates is equal to zero.

In region II, the electric field E:

E=σϵ0
E=17.0×10228.854×1012=1.92×1010N/C

The electric field between the plates is 1.92 x 10 – 10 N/C.