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Q.

A metallic rod falls under gravity with ends pointing in the direction east and west. Then :

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a

an emf is induced in it as it cuts BH

b

no emf is induced at all

c

two emfs of equal but opposite signs are induced giving no net emf

d

the gravitational field opposes its downwards motion

answer is A.

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Detailed Solution

As the rod whose ends pointing in east-west directions, falls under gravity , it crosses the horizontal component of earth's magnetic field. This produces the emf across the ends of the rod. 

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