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Q.

A spherical conductor of radius 2m is charged to a potential of 120 V. It is now placed inside another hollow spherical conductor of radius 6m. Calculate the potential to which the bigger sphere would be raised 

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a

60 V

b

40 V

c

80 V

d

20 V

answer is D.

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Detailed Solution

If charge acquired by the smaller sphere is Q then it’s potential

120=kQ2                 ….(i)

Also potential of the outer sphere 

V=kQ6                   …(ii)

From equation (i) and (ii) V = 40 volt 

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