A circular coil of mean radius of \( 7 \mathrm{~cm} \) and having&n...

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A circular coil of mean radius of \( 7 \mathrm{~cm} \) and having math xmlns=http://www.w3.org/1998/Math/MathMLmn4000/mn/math turns is rotated at the rate of math xmlns=http://www.w3.org/1998/Math/MathMLmn1800/mn/math revolutions per minute in the earths magnetic field \( (B=0.5 \) gauss), the maximum e.m.f. induced in coil will be
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