A straight conductor with its length in the East-West direction falls under gravity while sliding on a fixed conducting frame. Due to Earth's magnetic field :

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induced emf develops with the West-end at higher potential than the East-end and induced current passes from West to East

induced emf develops with the East end at higher potential than the West end and induced current in the conductor passes from East to West

sense of induced emf and induced current is unpredictable

induced emf develops with the East end at lower potential than the West-end and induced current in the conductor passes from West to East

answer is A.

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Detailed Solution

Force on positive charges will be towards east while force on electrons will be towards west. Hence east will be towards higher potential

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