If the magnetic moment and the pole strength of a bar magnet are 3.6 × 10 - 3 A m 2 and 120 × 10 - 3 A m , then its magnetic length is

Question

If the magnetic moment and the pole strength of a bar magnet are 3.6 × 10 - 3 A m 2 and 120 × 10 - 3 A m , then its magnetic length is, 3 c m, 0.3 c m, 3.3 c m, 33 c m

MARKS App · Accepted Answer

For a bar magnet, the magnetic moment is M = p o l e s t r e n g t h × m a g n e t i c l e n g t h So the magnetic length will be l mag = M m ⇒ l mag = 3.6 × 10 - 3 120 × 10 - 3 = 3 × 10 - 2 m = 3 c m

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