Q.

The magnitude of the earth’s magnetic field at a place is  B0 and the angle of dip is δ. A horizontal conductor of length l lying along the magnetic north-south moves eastwards with a velocity v. The emf induced across the conductor is

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a

Zero

b

B0l vsinδ

c

B0l v

d

B0l vcosδ

answer is B.

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Detailed Solution

When a conductor lying along the magnetic north-south, moves eastwards it will cut vertical component of  B0. So induced emf                  e=vBVl=vB0sin⁡δl=B0lvsin⁡δ
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The magnitude of the earth’s magnetic field at a place is  B0 and the angle of dip is δ. A horizontal conductor of length l lying along the magnetic north-south moves eastwards with a velocity v. The emf induced across the conductor is