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MHT CET 2019 (2 May, Shift 2) · Current Loop as a Magnetic Dipole

Current Loop as a Magnetic Dipole question from MHT CET 2019 (2 May, Shift 2)

Q69MHT CET 2019 · 2 MAY · SHIFT 2Easy

Current Loop as a Magnetic Dipole

Torque acting on a rectangular coil carrying current ' $i$ ' situated parallel to magnetic field of induction ' $B$ ', having number of turns ' $n$ ' and area ' $A$ ' is

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Answer: (c)

$\vec\tau = \vec m \times \vec B$ with $\vec m = ni\vec A$ .
$\vec\tau = ni(\vec A \times \vec B)$ ; with the coil plane parallel to B this is the maximum $niAB$ .
So the answer is (c).

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