A circular coil of 250 turns and diameter 18 cm carries a current of 12A. What is the magnitude of magnetic moment associated with the coil?

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#### Solution

M = N I A where A =π r^{2}

∴ M = NI π r2

∴ M = 250 x 12 x 3.14 x 81 x10^{-4}

∴ M = 76.30 A-m^{2}

Concept: Moving Coil Galvanometer

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