Question

Two concentric, spherical conducting shells have radii r₁ and r₂ and charges Q₁ and Q₂, as shown above. Let r be the distance from the center of the spheres and consider the region r₁ < r < r₂. In this region the electric field is proportional to

(A) Q₁/r² 

(B) (Q₁ + Q₂)/r² 

(C) (Q₁ + Q₂)/r 

(D) Q₁/r₁ + Q₂/r 

(E) Q₁/r + Q₂/r₂

Answer 1

The correct option is: (A) Q₁/r² 

Explanation:

When inside a uniform shell of charge, there is an electric field due to the shell. When outside a uniform shell of charge, the electric field is as if the shell was a point charge.