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Q.

Two spherical conductors A and B of radius a and b (b > a) are placed in air concentrically B is given charge + Q coulomb and A is grounded. The equivalent capacitance of these is

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a

4πε0abb−a

b

4πε0 (a+b)

c

4πε0b

d

4πε0b2b−a

answer is D.

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