A coil having N turns and cross-sectional area A is rotated in a uniform magnetic field B with an angular velocity ω. The maximum value of the emf induced in it is:
Correct answer: B. NBAω
- A. NBA/ω
- B. NBAω
- C. NBA/ω2
- D. NBAω²
Explanation
The induced emf in a rotating coil is given by ε = NBAω sin(ωt). The maximum value of the sine function is 1, so the maximum induced emf (εmax) occurs when sin(ωt) = 1. Therefore, εmax = NBAω.
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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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