A rectangular loop of dimensions and w moves with a constant velocity v away from a long

Question:

A rectangular loop of dimensions ℓ and w moves with a constant velocity v away from a long wire that carries a current I in the plane of the loop (Fig. P31.64). The total resistance of the loop is R. Derive an expression that gives the current in the loop at the instant the near side is a distance r from the wire.

- w -