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Class 12 › Physics › Moving Charges and Magnetism
CBSE2018Class Class 12 · Physics1 Marks · Mcq✅ Verified
A current-carrying loop is placed in a uniform magnetic field. The torque acting on it does NOT depend upon
A. area of loop
B. shape of loop
C. number of turns in loop
D. strength of current and magnetic field
✅ Answer & Solution
✅ Correct Answer: B
Torque $\tau = nIAB\sin\theta$.
It depends on $n$ (turns), $I$ (current), $A$ (area), and $B$ (magnetic field).
For a given area, the shape does not matter — only the enclosed area matters.
Hence torque does NOT depend on the shape of the loop.
