Suppose a long rectangular loop of width w is moving along the x-direction with its left arm in a magnetic field perpendicular to the plane of the loop (see figure). The resistance of the loop is zero and it has an inductance L. At time t = 0, its left arm passes the origin O.

If for ` t ge 0` the current in the loop is I and the distance of its left are arm from the origin is x then I versus x graph will be

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