NEET Physics Magnetic Force on Current MCQ Question
A rectangular coil with 100 turns, carrying a current of 3.2 A, is placed in a uniform magnetic field of 2 x 10^-3 T. If the area of the coil is 0.1 m^2 and the plane of the coil is initially parallel to the magnetic field, what is the torque experienced by the coil when it is rotated to be perpendicular to the magnetic field?
0 N m
10 N m
20 N m
30 N m
Correct Answer
Detailed Explanation
The torque τ experienced by the coil is given by τ = N I A B sin θ. Initially, θ = 0°, so τ = 0. When the coil is perpendicular, θ = 90°, so τ = 100 * 3.2 * 0.1 * 2 x 10^-3 = 20 N m.
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