A resistance `R` is connected between the two ends of the parallel smooth conducting rails.A conducting rod lies on these fixed horizontal rails and a uniform constant magnetic field `B` exists perpendicular to the plane of the rails as shown in the figure.If the rod is given a velocity `v` and released as shown in figure, it will stop after some time, which option are correct:

Options

A. The total work done by magnetic field is negative.
B. The total work done by magnetic field is positive.
C. The total work done by magnetic field is zero.
D. loss in kinetic energy of conducting rod is equal to heat generate between `R`.

Answer

C, D

Explanation

Magnetic field cannot do work