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 to?
A
20 V
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B
60 V
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C
80 V
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D
40 V
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Solution
The correct option is D 40 V 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