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A coil of area A and N turns is rotating with angular velocity ω in a uniform magnetic field → B about an axis perpendicular to → B . Magnetic flux ϕ and induced emf ε across it, at an instant when B is parallel to the plane of coil, are :

1. ϕ = AB, ε = 0
2. ϕ = 0, ε = NAB ω
3. ϕ = 0, ε = 0
4. ϕ = AB, ε = NAB ω

Correct answer: ϕ = 0, ε = NAB ω

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