MDCAT Physics MCQ #93

Why does a moving coil ammeter show zero for AC current without a rectifier?

MDCAT Physics MCQ #93

  1. Question 1

    Q1. Why does a moving coil ammeter show zero for AC current without a rectifier?

    • A) Coil moves in fixed magnetic field
    • B) Meter needle averages to zero
    • C) AC current burns out the coil
    • D) Spring tension prevents movement

    Answer: Meter needle averages to zero

    Explanation: AC reverses direction, causing needle to vibrate around zero. Option A describes DC meter operation.