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Question

We  have  an  isolated conducting spherical shell of radius . Some positive charge is given to it so that the resulting electric field has a maximum intensity of .The same amount of negative charge is given to another isolated conducting spherical shell of radius . 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 :

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A

B

C

D

Hard

Solution

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Correct option is
C

Let the charge on the shell of 10 cm radius is .


When radii shell is kept inside radii shell the whole charge will appear on the surface of outer shell.

The electric field intensity just inside the outer sphere is:

As the energy is stored over the surface of shell of radii 20 cm so its stored energy is:

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