First slide

Motional EMF

Question

A 10 metre long wire, kept in east-west direction, is falling with velocity 5 m/s pe{perpendicular to the field $0.3 \times 10^{- 4}$ Wb/m². The induced e.m.f. across the terminal will be

Easy

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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