engineering physics MCQ #1221

The self-inductance of a coil is 2 H. If current changes from 0 to 5 A in 1 / 2 s, induced emf is

engineering physics MCQ #1221

  1. Question 1

    Q1. The self-inductance of a coil is 2 H. If current changes from 0 to 5 A in 1 / 2 s, induced emf is

    • A) 10 V
    • B) 20 V
    • C) 40 V
    • D) 80 V

    Answer: 20 V

    Explanation: Induced emf = -L(dI/dt) = -2 * (5 / 0.5) = -20 V.