NEET Physics Motional EMF MCQ Question
A horizontal straight wire 10 m long is falling at right angles to the Earth's magnetic field of 0.30 × 10⁻⁴ Wb m⁻² with a speed of 5.0 m s⁻¹. What is the instantaneous value of the emf induced in the wire?
0.015 V
0.150 V
0.75 V
1.50 V
Correct Answer
Detailed Explanation
The induced emf (ε) is given by the formula ε = Bvl, where B is the magnetic field (0.30 × 10⁻⁴ Wb m⁻²), v is the velocity (5.0 m s⁻¹), and l is the length of the wire (10 m). Calculating gives ε = 0.30 × 10⁻⁴ × 5 × 10 = 0.015 V.
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