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Question

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


A
q3
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B
q2
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C
+q3
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D
+q2
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Solution

The correct option is C +q3
Let q be the charge on the inner shell when it is earthed.

Potential of inner shell will be zero as it is grounded.

So, kqr+kq3r=0

q=q3

Therefore, +q3 charge will flow from inner shell to earth.
Why this question?

Concept- When an object is grounded, its potential become equal to potential of earth i.e V=0

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