Physics-Magnetic Properties of Materials
NEET Physics Magnetic Properties of Materials MCQ Question
Type: MCQ-diagram based-Easy-Class 12
In the diagram shown above, if the angle θ between the magnetic moment m and the magnetic field B is small, what is the approximate expression for the torque τ experienced by the magnetic moment?
A
τ ≈ mBθ
B
τ ≈ mB/θ
C
τ ≈ mBθ^2
D
τ ≈ mB/θ^2
Correct Answer
Option A
Detailed Explanation
For small angles θ, sin θ can be approximated as θ. Thus, the torque τ = mB sin θ becomes τ ≈ mBθ.
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