Physics
A wire is dropped freely towards earth. Will any emf be induced across the ends of wire, if wire is initially in
(a) north-south direction?
(b) east-west direction?
Electro-Magnetism
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Answer
(a) In the North-South direction, the wire is moving parallel to the Earth's magnetic field, hence, there would be minimal or no induced emf.
(b) In the East-West direction, the wire is moving perpendicular to the Earth's magnetic field, hence, there would be an induced emf due to the motion of the wire across the magnetic field lines.
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