Question

STATEMENT - 1 : 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. The total work done by magnetic field is negative .

STATEMENT - 2 : If force acts opposite to direction of velocity its work done is negative.

• A. Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
• B. Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
• C. Statement-1 is True, Statement-2 is False
• D. Statement-1 is False, Statement-2 is True

Answer 1

The correct option is D Statement-1 is False, Statement-2 is True

Magnetic field cannot do work since field is perpendicular to velocity, hence statement-1 is false