A spherical conductor of radius 2 m is charged to a potential of 120 V. It is now placed inside another hollow spherical conductor of radius 6 m. Calculate the potential to which the bigger sphere would be raised.
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a
20 V
b
60 V
c
80 V
d
40 V
answer is D.
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Detailed Solution
If charge acquired by the smaller sphere is Q, then its potential 120=kQ2 ….(i)Also, potential of the outer sphere V=kQ6 . . . . (ii)From equations (i) and (ii), V = 40 volt