First slide

Magnetic flux and induced emf

Question

A 10 metre wire kept in east-west falling with velocity 5 m/sec perpendicular to the field $0.3 \times 10^{- 4} Wb / m^{2}$ . The induced e.m.f. across the terminal will be

Moderate

A

0.15 V
B

1.5 mV
C

1.5 V
D

15.0 V

Solution

Induced e.m.f. $= Blv = 0 .3 \times 10^{- 4} \times 10 \times 5$
$= 1 .5 \times 10^{- 3} V = 1 .5 mV$

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