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Q.

A copper sphere A, of radius R, carrying a charge Q is concentrically placed inside a thin spherical copper shell B of radius 2R. If outer surface of B is earthed, potential of A is

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a

Zero     

b

Q4πε0R

c

Q8πε0R

d

Q2πε0R

answer is C.

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Detailed Solution

Charge on the inner surface of B is –Q.

Charge on the outer surface of B is zero.

Charge on sphere A is +Q

VA=14πε0+QR+  14πε0Q2R=  Q8πε0R  

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