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Question

A flat coil of 500 turns each of area 50 cm2 rotates in a uniform magnetic field of 0.14 Wb/m2 about an axis normal to the field at an angular speed of 150 rad s1. The coil has a resistance of 5 Ω. The induced e.m.f is applied to an external resistance of 10 Ω. The peak current through the resistance is _________A.

A
3.50
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B
3.5
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Solution

N=500;A=50 cm2=50×104 m2

B=0.14 Wb/m2;W=150 rad s1

Emax=NBAω

=500×0.14×50×104×150

=25×14×15×102

Imax=EmaxR=25×14×15×10210+5=3.5 A

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