NEET Physics Magnetic Force on Current MCQ Question
Which combination of statements about the magnetic force on a current-carrying loop in a uniform magnetic field is correct?
The force on the arms AD and BC is zero, and the forces on arms AB and CD are equal and opposite.
The net force on the loop is non-zero, causing it to accelerate in the direction of the magnetic field.
The torque on the loop tends to rotate it anticlockwise, and the loop is in stable equilibrium when aligned with the magnetic field.
The magnetic force does work on the current-carrying loop, leading to a change in kinetic energy.
Correct Answer
Detailed Explanation
The forces on arms AD and BC are indeed zero due to their alignment with the magnetic field, while the forces on arms AB and CD are equal in magnitude but opposite in direction, resulting in no net force but a torque that tends to rotate the loop. Statements about non-zero net force and work done are incorrect as the magnetic force is always perpendicular to the motion.
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