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Physics-

General

Easy

Question

A conducting rod of length $lambda$ is moved at constant velocity ‘ $V subscript 0 end subscript$ ’ on two parallel, conducting, smooth, fixed rails, that are placed in a uniform constant magnetic field B perpendicular to the plane of the rails as shown in figure. A resistance R is connected between the two ends of the rail. Then which of the following is/are correct :

The thermal power dissipated in the resistor is equal to rate of work done by external person pulling the rod.
If applied external force is doubled than a part of external power increases the velocity of rod.
Lenz’s Law is not satisfied if the rod is accelerated by external force
If resistance R is doubled then power required to maintain the constant velocity $V_{0}$ becomes half.

The correct answer is: The thermal power dissipated in the resistor is equal to rate of work done by external person pulling the rod.

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