I have read in my schoolbook that when a wire of length l moves at velocity v in a magnetic field cutting the flux lines an emf is induced which it is calculated from emf = blv, I understand that emf is induced at time variation of magnetic flux across the wire, but I Can't see any change in the magnetic flux here, the magnetic flux should stay the same anywhere the wire moves in the field as long as it not getting nearer to or farther from the magnet. But It seems non logical that the flux changes just because the wire covers a certain area during its movement in the field !!!!!!! Please, this point is bothering me very much I would be very thankful if anyone could explain it to me, thanks in advance
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