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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
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
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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).
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).