STANDARDPhysics-Electromagnetic Induction
STANDARD Physics Motional EMF MCQ Question
Type: MCQ-numerical-Medium-Class 12
A 10 m long horizontal wire extends from north-east to south-west. It is falling with a speed of 5.0 m s⁻¹, at right angles to the horizontal component of the earth's magnetic field of 0.3 × 10⁻⁴ Wb/m². The value of the induced emf in wire is
A
0.3 × 10⁻³ V
B
2.5 × 10⁻³ V
C
1.5 × 10⁻³ V
D
1.1 × 10⁻³ V
Correct Answer
Option C
Detailed Explanation
The motional emf is given as ε = |v| |B| = 5 × (0.3 × 10⁻⁴) (10) sin90° = 1.5 × 10⁻³ V.
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