Physics-Motional EMF
NEET Physics Motional EMF MCQ Question
Type: MCQ-diagram based-Hard-Class 12
Consider a scenario where a rod is rotating about an axis normal to the rod passing through its one end, while the other end is in contact with a circular metallic ring. A constant and uniform magnetic field of 0.5 T is parallel to the axis. What determines the magnitude of the motional emf developed between the center and the ring?
A
The length of the rod and the speed of rotation.
B
The mass of the rod and the magnetic field strength.
C
The temperature of the rod and the material of the ring.
D
The radius of the circular ring and the resistance of the rod.
Correct Answer
Option A
Detailed Explanation
The magnitude of the motional emf is determined by the length of the rod and its speed of rotation in the magnetic field, as per the expression Blv.
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