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

• 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 1

Answer: (C), (D)

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.

$\therefore$ Option $C,D$ is correct.