JEE Main · PhysicsHard
A metal rod of length rotates with angular velocity about an axis passing through one end and perpendicular to the rod in a uniform magnetic field directed parallel to the axis of rotation. What is the induced emf across the ends of the rod?
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: C —
Solution
The motional emf is . Here is in the plane of rotation and is perpendicular to the plane, so is radial. However, the path is along the rod, making the dot product zero.
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