We have an isolated conducting spherical shell of radius 10cm.
Some positive charge is given to it so that the resulting electric field
has a maximum intensity of 1.8×106NC−1.The same amount of negative charge is given to another
isolated conducting spherical shell of radius 20cm. Now, the first
shell is placed inside the second so that both are concentric as shown
in figure. The electrostatic energy stored in the system is :
1.0J
0.045J
0.09J
1.8J
A
0.09J
B
1.0J
C
1.8J
D
0.045J
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Solution
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Let the charge on the shell of 10 cm radius is Q. E=Q4πϵ0(0.1)2⇒Q=1.8×106×4πϵ0(0.1)2
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