A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. If the inner sphere is charged to a potential 3 esu while the outer sphere is earthed, then the charge on the inner sphere will be
A
esu
B
30 esu
C
36 esu
D
54 esu
Text Solution
Verified by ExpertsThe correct answer is:
C
Let the charge on the inner sphere be Q, then the charge induced on the inner surface of the outer sphere is -Q.
Electric potential V of the inner sphere is given by,
Charge on the inner sphere, 
esu
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