MDCAT Physics MCQ #462

A wire of resistance 5 ohms is stretched to double its length. What is its new resistance?

MDCAT Physics MCQ #462

  1. Question 1

    Q1. A wire of resistance 5 ohms is stretched to double its length. What is its new resistance?

    • A) 10 ohms
    • B) 20 ohms
    • C) 5 ohms
    • D) 2.5 ohms

    Answer: 20 ohms

    Explanation: Resistance is directly proportional to length and inversely proportional to cross-sectional area. When length doubles, area halves, so R quadruples.