NEET Physics Motional EMF MCQ Question
Consider a wheel with 10 metallic spokes each 0.5 m long, rotating with a speed of 120 revolutions per minute in a plane normal to the horizontal component of the Earth's magnetic field (H_E = 0.4 G). Which of the following expressions correctly represents the induced emf between the axle and the rim of the wheel?
(1/2) ω B R^2
ω B R
B ω R^2
(1/2) B ω R
Correct Answer
Detailed Explanation
The induced emf in a rotating wheel with spokes is given by the formula (1/2) ω B R^2, where ω is the angular velocity, B is the magnetic field, and R is the length of the spokes.
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