JEE Main 2024 Physics question
A rod of length 60 cm rotates with a uniform angular velocity 20 rad s about its perpendicular bisector, in a uniform magnetic field 0.5 T. The direction of magnetic field is parallel to the axis of rotation. The potential difference between the two ends of the rod is V.
Answer: 0
Solution
The two halves of the rod have equal and opposite emfs about the centre (Bωℓ²/8 each), so the potential difference between the ends is zero.