engineering physics MCQ #1267

The magnetic flux through a coil is ϕ = 3t² + 2t + 1. The induced emf at t = 1 s is

engineering physics MCQ #1267

  1. Question 1

    Q1. The magnetic flux through a coil is ϕ = 3t² + 2t + 1. The induced emf at t = 1 s is

    • A) 8 V
    • B) -8 V
    • C) 6 V
    • D) -6 V

    Answer: 8 V

    Explanation: ε = -dϕ/dt = -(6t + 2), at t = 1, ε = -(6 + 2) = -8 V, magnitude is 8 V.