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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