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An electric potential difference will be induced between the ends of the conductor shown in the diagram when the conductor moves in the direction

1. P
2. Q
3. L
4. M

Correct answer: M

Solution

A moving conductor in a magnetic field experiences a motional emf due to the magnetic force on charges. The direction of induced potential difference is determined by $\vec v\times \vec B$. For the given arrangement, that direction corresponds to M.

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