engineering physics MCQ #1259

The magnetic flux through a coil is given by ϕ = 5t² + 3t + 2. What is the induced emf at t = 2 s?

engineering physics MCQ #1259

  1. Question 1

    Q1. The magnetic flux through a coil is given by ϕ = 5t² + 3t + 2. What is the induced emf at t = 2 s?

    • A) 23 V
    • B) 20 V
    • C) 10 V
    • D) 26 V

    Answer: 23 V

    Explanation: ε = -dϕ/dt = -(10t + 3), at t = 2, ε = -(10*2 + 3) = -23 V, magnitude is 23 V.