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Question

The figure shows an imaginary cube of length L/2 and a uniformly charged rod of length L touching the centre of the right face of the cube normally. At time t=0, the rod starts moving to the left slowly at a constant speed 'v'. the electric flux(F) through the cube is plotted against time(t). the correct graph showing the variation of flux with time is


A
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B
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C
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D
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Solution

The correct option is A

Flux first increases linearly ( V is constant), remains constant (when length L/2 is inside the cube) and then decreases linearly (as rod moves out).


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