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Question

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 C 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

Physics

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