A rectangular coil of n turns has area A and it is placed in uniform magnetic field B. If the current passing through the coil is 'I' then the torque acting on the coil is (a) I/n(A × B) (b) nI(A · B) (c) nI(A × B) (d) n/I(A · B)

Answer: (c). Magnetic moment m = nI A. τ = m × B = nI( A × B), so the answer is (c).

A rectangular coil of n turns has area A and it is placed in uniform… | MHT CET 2026 (20 May, Shift 1)

Q3MHT CET 2026 · 20 MAY · SHIFT 1Easy

Current Loop as a Magnetic Dipole

A rectangular coil of $n$ turns has area $\vec{A}$ and it is placed in uniform magnetic field $\vec{B}$ . If the current passing through the coil is 'I' then the torque acting on the coil is

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Answer: (c)

Magnetic moment $\vec m = nI\vec A$ .
$\vec\tau = \vec m \times \vec B = nI(\vec A \times \vec B)$ , so the answer is (c).

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