Physics

Physics

Problem

A coil of

50

turns and area

0.015\,\text{m}^2

rotates with constant angular speed

100\,\text{rad s}^{-1}

in a uniform magnetic field of

0.25\,\text{T}

. At

t=0

, the plane of the coil makes an angle of

30^{\circ}

with the magnetic field. The earliest time

t>0

at which the induced emf becomes zero is: a)

52\,\text{ms}

b)

31\,\text{ms}

c)

26\,\text{ms}

d)

21\,\text{ms}

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