Figure (30-Q2a) shows an imaginary cube of edge \( L / 2 \). A unif...

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Figure (30-Q2a) shows an imaginary cube of edge \( L / 2 \). A uniformly charged rod of length \( L \) moves towards left at a small but constant speed \( v \). At \( t=0 \), the left end just touches the centre of the face of the cube opposite it. Which of the graphs shown in figure (30-Q2b) represents the flux of the electric field through the cube as the rod goes through it?
(a)
(b)
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