engineering physics MCQ #1239

A coil of 100 turns and area 0.1 m² is placed in a magnetic field of 0.5 T. If it's rotated by 90° in 0.1 s, find induced emf.

engineering physics MCQ #1239

  1. Question 1

    Q1. A coil of 100 turns and area 0.1 m² is placed in a magnetic field of 0.5 T. If it's rotated by 90° in 0.1 s, find induced emf.

    • A) 5 V
    • B) 50 V
    • C) 0 V
    • D) 25 V

    Answer: 50 V

    Explanation: ε = -N(dϕ/dt) = -100 * 0.1 * 0.5 / 0.1 = 50 V.