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Magnetic Field Due to Current in a Solenoid

A current car...

Question

A current carrying small loop behaves like a small magnet. If $A$ be its area and $M$ its magnetic moment, the current in the loop will be

A

M / A

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B

A / M

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C

M A

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D

A m^{2}

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Solution

The correct option is A $M / A$
Magnetic moment is defined as $M = i A$ $\Rightarrow i = \frac{M}{A}$ .

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