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Question

A resistance R is connected between the two ends of the parallel smooth conducting rod 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
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A
The total work done by magnetic field is negative.
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B
The total work done by magnetic field is positive
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C
The total work done by magnetic field is zero
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D
loss in kinetic energy of conducting rod is equal to heat generate between R
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Solution

The correct options are
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
Work done by meganetic field is zero.
Less in kinetic energy =heat produced in resistance.
Option C,D is correct.

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