A point charge q is moving towards conducting spherical shell at constant velocity v. Shell is connected to ground.
A
As charge moves towards shell, current flows from shell to earth.
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B
As charge approaches shell, current increases.
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C
Current increases linearly.
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D
Current decreases as charge approaches shell.
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Solution
The correct options are A As charge moves towards shell, current flows from shell to earth. B As charge approaches shell, current increases. Potential at O is zero ∴kqx+kq′R=0 q′=−qRx
i=dq′dt=ddt(−qRx)=qRx2(dxdt)=−qRVx2 By analysing this equation, we can conclude the correct options.