New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    What happens to the resistance of a wire if its length

    is doubled?  
    A Doubles Correct Answer Incorrect Answer
    B Halves Correct Answer Incorrect Answer
    C Becomes four times Correct Answer Incorrect Answer
    D Remains same Correct Answer Incorrect Answer

    Solution

    Resistance R ∝ L, where L = length of the wire.   Doubling the length doubles the resistance (assuming area and material same).   This is used in designing electrical circuits.   Thinner and longer wires have more resistance.

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