Two concentric hollow conduction spheres of radii R₁ and R₂ have charges q₁ and q₂ respectively. If R₂ > R₁, then the electric field intensity at a distance r from the common centre is (R₂ > r > R₁)

Given data: Two concentric hollow conduction spheres of radii R₁ and R₂ have charges q₁ and q₂ 

Concept used: Electric fields

Detailed solution: 

Since we have hollow spheres charge is distributed only on the surface of the spheres.

Therefore, Electric field at a distance r is due to because of inner hollow sphere

$\Rightarrow E=\frac{1}{4\pi {\in }_0}\frac{q_1}{r^2}$

The correct option is A