Q.

A positive charge Q is distributed uniformly throughout the volume of an insulating sphere of radius R centered at origin. A positive charge Q is placed at x = 2R on the X - axis. The magnitude of the electric field at x=R2 on the X - axis will be 

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a

Q8πϵ0R2i^

b

Q9πϵ0R2i^

c

-Q8πϵ0R2i^

d

Q72πϵ0R2i^

answer is D.

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Detailed Solution

The electric field at x=R2 would be due to sphere and due to point charge.

E=Q×R24πϵ0R3Q4πϵ03R22i^=Q72πϵ0R2i^

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A positive charge Q is distributed uniformly throughout the volume of an insulating sphere of radius R centered at origin. A positive charge Q is placed at x = 2R on the X - axis. The magnitude of the electric field at x=R2 on the X - axis will be