NEET 2022 · PhysicsAC generatorPrevious Year Question
A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at 2 rad s⁻¹. If the vertical component of earth's magnetic field at that place is 2 × 10⁻⁵ T and electrical resistance of the coil is 12.56 Ω, then the maximum induced current in the coil will be:
Answer: (C) 1 A. Answer: (c) Solution: For a rotating coil, peak emf ε₀ = NBAω and peak current I₀ = ε₀/R.
- A.0.25 A
- B.1.5 A
- C.1 A✓
- D.2 A
Correct Answer
(C) 1 A
Solution & Explanation
Answer: (c) Solution: For a rotating coil, peak emf ε₀ = NBAω and peak current I₀ = ε₀/R. Area A = πr² = π(10)² = 100π m². So ε₀ = 1000 × (2 × 10⁻⁵) × 10⁰π × 2 = 4π × 10⁻¹·... ≈ 12.566 V. I₀ = ε₀/R = 12.566 / 12.56 ≈ 1 A. So the answer is C (1 A).
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