Figure (i) shows an imaginary cube of edge length L. A uniformly charged rod of length 2L moves towards left at a small but constant speed v. At t = 0, the left end of the rod just touches the center of the face of the cube opposite to it. Which of the graphs shown in fig.(ii) represents the flux of the electric field through the cube as the rod goes through it?
(i) 
(ii) 
Text Solution
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From stage 1 to stage 2 ⇒ enclosed charge is increasing means flux is increasing
From stage 2 to stage 3 ⇒ enclosed charge is constant means flux is constant
From stage 3 to stage 4 ⇒ enclosed charge is decreasing means flux is decreasing
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