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Motional EMF

A car moves u...

Question

A car moves up a plane road. The induced emf in the axle connecting the two wheels is maximum when it moves

A

At the poles

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B

At equator

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C

Remains stationary

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D

No emf is induced at all

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Solution

The correct option is B At the poles
Induced emf in the axle $= B l v$
$v -$ velocity of car
$l -$ length of car
$B -$ component of magnetic field perpendicular to both l and v .
That is B is the vertical component of magnetic field.
Vertical component of magnetic field is maximum at the poles.
Therefore emf induced in the axle will be maximum at the poles.

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