NEET 2023 Phase 2 · PhysicsAC generatorPrevious Year Question
An emf is generated by an ac generator having 100 turn coil, of loop area 1 m². The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of 0.05 T perpendicular to the axis of rotation of the coil. The maximum value of emf is:
Answer: (D) 31.4 V. Answer: (d) Solution: Peak emf of an ac generator: ε₀ = NBAω, with ω = 2πf.
- A.62.8 V
- B.6.28 V
- C.3.14 V
- D.31.4 V✓
Correct Answer
(D) 31.4 V
Solution & Explanation
Answer: (d) Solution: Peak emf of an ac generator: ε₀ = NBAω, with ω = 2πf. Here f = 1 rev/s so ω = 2π rad/s; N = 100, B = 0.05 T, A = 1 m². ε₀ = 100 × 0.05 × 1 × 2π = 10π ≈ 31.4 V. So the answer is D (31.4 V).
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