Answer :

The potential difference across the two ends is given by


Where is the emf or potential difference


v velocity of conducting rod


B is the magnetic field


L is the length of the rod


Consider some conditions,


i. The magnetic field is in the perpendicular direction to the velocity of the rod


ii. The magnetic field is in the perpendicular direction to the length of the rod


iii. The velocity of the rod is perpendicular to the direction to the length of the rod


In the above-mentioned conditions, only the potential difference across the two ends will be non zero.


In the given conditions in the A, B and C, the potential difference across the two ends is zero. So option D is correct.

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