First slide

Motional EMF

Question

The length of each side of a square coil of 10 turns is 12 cm. This coil rotates in a magnetic field of flux density 0.025 tesla. If the maximum induced e.m.f. is 20 mV then angular velocity of the coil will be

Moderate

A

0.55 rad/s
B

5.55 rad/s
C

1.55 rad/s
D

Zero

Solution

$ω = \frac{e}{BAn} = \frac{20 \times 10^{- 3}}{0 \cdot 025 \times {(12 \times 10^{- 2})}^{2} \times 10} = 5 \cdot 55 rad / s$

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