NEET Physics Motional EMF MCQ Question
A horizontal straight wire 10 m long, extending from east to west, falls with a speed of 5.0 m/s at right angles to the horizontal component of the Earth's magnetic field, which is 0.30 × 10^-4 Wb/m². What is the instantaneous emf induced in the wire?
5 × 10^-4 V
0 × 10^-4 V
5 × 10^-3 V
0 × 10^-3 V
Correct Answer
Detailed Explanation
The induced emf is calculated using the formula emf = B * l * v, where B is the magnetic field, l is the length of the wire, and v is the velocity. Here, emf = 0.30 × 10^-4 T * 10 m * 5 m/s = 1.5 × 10^-4 V.
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