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The long straight wire in figure (a) car...

The long straight wire in figure (a) carries a constant current `i`. A metal bar of length `i` is moving at constant velocity `v` as shown in figure. Point a is a distance d from the wire.

(a) Calculate the emf induced in the bar.
(b) Which point `a` or `b` is at higher potential?
(c) If the bar is replaced by a rectangular wire loop of resistance `R`, what is the magnitude of current induced in the loop?

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