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NEET 2013 · Field of a Magnet & Magnet in a Uniform Field

Field of a Magnet & Magnet in a Uniform Field question from NEET 2013

Q22NEET 2013Easy

Field of a Magnet & Magnet in a Uniform Field

A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will be

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Answer: (a)

Perpendicular to $B$ , the two pole forces form a couple: $\tau = F \times l$ .
Also $\tau = MB\sin 90^\circ = MB$ .
$Fl = MB \Rightarrow l = \dfrac{MB}{F}$
So the answer is (a).

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