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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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$M B / F$

$M F / B$

$B F / M$

$F / M B$

answer is B.

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Detailed Solution

$F L = MB (= Torque) \Rightarrow L = \frac{MB}{F}$

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