# Thread: Magnitude of induced e.m.f

1. 1)A car moves on a plane road. The induced e.m.f in the axle connecting the 2 wheels is maximum when it moves:
a)eastward at the equator
b)westward at the equator
c)eastward in the latitude 45 degrees
d)at the poles
The answer to this given in my book is (d) at the poles. I think it is because the strength of the field is maximum at the poles. I have my own doubts whether the field is maximum at the poles. Its just a guess. Please guide me.

2.

3. the emf is e=vBl sin a
where v is velocity, B is the magnetic field at that point and l is the distance between the points, and a is the angle between the movement and the magnetic fields

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