A rectangular coil of dimensions 0.1 m × 0.2 m with 20 turns rotates at 1200 rpm in a 0.6 T magnetic field. The peak emf induced is:
Correct answer: B. 60.3 V
- A. 30.2 V
- B. 60.3 V
- C. 75.4 V
- D. 90.5 V
Explanation
Peak emf = NBAω, where N = 20, B = 0.6 T, A = 0.1 × 0.2 = 0.02 m2, ω = 2πf = 2π × (1200/60) = 40π rad/s. Thus, εmax = 20 × 0.6 × 0.02 × 40π ≈ 60.3 V.
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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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