NEET Physics Magnetic Force on Current MCQ Question
A rectangular loop of wire is placed in a uniform magnetic field such that the field is in the plane of the loop. If the current in the loop is 3 A and the magnetic field strength is 0.5 T, what is the magnitude of the force on one of the arms of the loop perpendicular to the magnetic field?
5 N
3 N
0 N
0.75 N
Correct Answer
Detailed Explanation
The force on a straight segment of the loop is given by F = I * b * B. For an arm perpendicular to the field, the force is F = 3 A * b * 0.5 T = 1.5 b N, where b is the length of the arm. Because the loop is symmetrical, this is the force on one such arm.
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