MDCAT Physics MCQ #543

A copper wire carries a current of 2A. Why is the drift velocity of electrons much smaller than the speed of the current signal?

MDCAT Physics MCQ #543

  1. Question 1

    Q1. A copper wire carries a current of 2A. Why is the drift velocity of electrons much smaller than the speed of the current signal?

    • A) Electrons travel at the speed of light in the wire
    • B) The high charge density in metals reduces effective electron speed
    • C) Current is carried by protons moving in the opposite direction
    • D) Drift velocity is equal to the thermal velocity of electrons

    Answer: The high charge density in metals reduces effective electron speed

    Explanation: High charge density means small drift velocity is sufficient to carry large current. Option D confuses thermal motion with drift velocity.