engineering physics MCQ #921

A wire of resistance 4 ohm is stretched to twice its original length. Its new resistance is

engineering physics MCQ #921

  1. Question 1

    Q1. A wire of resistance 4 ohm is stretched to twice its original length. Its new resistance is

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

    Answer: 16 ohm

    Explanation: Using R = ρl / A, when l is doubled and A is halved, R becomes 4 times, hence new R = 4 * 4 = 16 ohm