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A straight magnetic strip has a magnetic moment of 44 A m². If the strip is bent in a semicircular shape, its magnetic moment will be ______ A m². (Given π = (22)/7)

Asked in JEE Main 9th April 2nd Shift 2024 · Field of a bar magnet and earth's field

Answer: 28

Step-by-step solution

Pole strength is unchanged; the moment scales with the distance between the ends.

Straight: M = m l. Semicircle: π R = l, ends separated by 2R = (2l)/π.

M' = (2M)/π = (2 × 44 × 7)/(22) = 28 A m²

→ 28

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