Question

A rectangular coil of 300 turns has an average area of 25 cm× 10 cm. The coil rotates with a speed of 50 cps in a uniform magnetic field of strength $4 \times 10^{- 2}T$ about an axis perpendicular to the field. The peak value of the induced emf is (in volt)

• A. 3000 π
• B. 300 π
• C. 30 π
• D. 3π

Answer 1

Answer: (C)

30 π

Answer 2

Peak value of emf = e₀ = ωNBA = 2πν NBA = 2π × 50 × 300 × 4 × 10^–2 × (25 × 10^–2 × 10 × 10^–2) = 30 π volt