A circular coil of radius \( 4 \mathrm{~cm} \) has 50 turns. In thi...

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A circular coil of radius \( 4 \mathrm{~cm} \) has 50 turns. In this coil a current of \( 2 \mathrm{~A} \) is flowing. It is placed in a magnetic
\( \mathrm{P} \) field of \( 0.1 \) weber \( / \mathrm{m}^{2} \) perpendicular to the palane of

WV coil. The amount of work done in rotating it through \( 180^{\circ} \) from its equilibrium position will be
(1) \( 0.1 \mathrm{~J} \)
(2) \( 0.2 \mathrm{~J} \)
(3) \( 0.4 \mathrm{~J} \)
(4) \( 0.8 \mathrm{~J} \)
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