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Question: Two concentric conducting spheres of radii r<sub>1</sub> and r<sub>2</sub> (r<sub>1</sub>\< r<sub>2<...

Two concentric conducting spheres of radii r1 and r2 (r1< r2) carry electric charges of + Q and – Q respectively. The region between the sphere is filled with two insulating layers of dielectric constant e1 and e2 and width d1 and d2 respectively. Variation of potential and electric field with radial distance from O is given. Select the correct one. (assume Vat r2 = 0)

A

B

C

D

Answer

Explanation

Solution

Electric field

r < r1, E = 0

r1 < r < r1 + d, E =

r1 + d < r < r2, E =

r > r2, E = 0

\ (2) and (4) is wrong

Potential can be find out by integrating

i.e. V = = 0