Question

A metallic conductor of length 1 m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5 rad s -1. If the horizontal component of earth's magnetic field is 0.2 × 10-4 T, then emf induced between the two ends of the conductor is:

• A. 5 μV
• B. 50 μV
• C. 5 mV
• D. 50 mV

Answer 1

Answer: (B)

50 μV

Answer 2

Emf = $(\frac{1}{2})$B ω l 2
= $(\frac{1}{2})$× 0.2 × 10–4 × 5 × 12 V
= 0.5 × 10–4 V
= 50 μV

$\therefore,$ The correct answer is (B): 50 μV