Question

Figure shows two conducting thin concentric shells of radii r and 3r . The outer shell carries charge q . Inner shell is neutral . Find the charge that will flow from inner shell to outer after the switch S is closed .

Answer 1

When the switches are  closed the potential of both the shells should be equal.

Let us assume that the charge x flows from the outer shell to inner shell

Show the charge of the outer shell becomes q-x and the charge of the inner shell is x

Since the potential of both the shells are equal

k(q-x)÷3r= kx÷r

q-x=3x

4x=q

x=q÷4

A charge of q÷4 flows from outer shell to inner shell or in other words a charge of -q÷4 flows from inner shell to outer shell.

Answer 2

Explanation:

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