The effective radius of a circular coil is \( R \) and number of turns is \( N \). The current t...

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The effective radius of a circular coil is \( R \) and number of turns is \( N \). The current through it is \( i \) ampere. The work done in rotating the coil by angle of \( 180^{\circ} \) in an external magnetic field \( B \) will - be (initially plane of coil is perpendicular to - magnetic field)
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