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JEE Main 2025 Jan 22 Shift 2, Physics Q9: Motional EMF

JEE Main2025Jan 22, Shift 2Physics
Q.

A rectangular metallic loop is moving out of a uniform magnetic field region to a field free region with a constant speed. When the loop is partially inside the magnate field, the plot of magnitude of induced emf () with time (t) is given by

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

Solution

While the loop is partially inside the uniform magnetic field region and moving out with constant velocity , only the trailing edge of length cuts the field lines.

The motional emf across this edge is:

.

Since , and are all constants during the exit, stays constant in time until the loop fully leaves the field.

The plot is a horizontal straight line, option (4).

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