Physics-Motional EMF
NEET Physics Motional EMF MCQ Question
Type: MCQ-numerical-Easy-Class 12
A horizontal straight wire 10 m long is falling with a speed of 5.0 m/s at right angles to the horizontal component of the Earth's magnetic field, 0.30 × 10⁻⁴ Wb/m². What is the instantaneous value of the emf induced in the wire?
A
0.15 V
B
1.5 V
C
0.03 V
D
3.0 V
Correct Answer
Option A
Detailed Explanation
The induced emf (ε) is calculated using the formula ε = Bvl, where B is the magnetic field (0.30 × 10⁻⁴ T), v is the velocity (5.0 m/s), and l is the length of the wire (10 m). Thus, ε = 0.30 × 10⁻⁴ × 5.0 × 10 = 0.15 V.
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