engineering physics MCQ #976

A wire of resistance 4 ohm is stretched to twice its original length. The resistance of the stretched wire would be?

engineering physics MCQ #976

  1. Question 1

    Q1. A wire of resistance 4 ohm is stretched to twice its original length. The resistance of the stretched wire would be?

    • A) 16 ohm
    • B) 8 ohm
    • C) 4 ohm
    • D) 2 ohm

    Answer: 16 ohm

    Explanation: Resistance R = ρl / A. When l doubles, A halves, so R' = 4R = 16 ohm.