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    Question

    The resistance of a wire is directly proportional

    to:
    A Square of its length Correct Answer Incorrect Answer
    B Its length and inversely proportional to area Correct Answer Incorrect Answer
    C Its area Correct Answer Incorrect Answer
    D Its temperature only Correct Answer Incorrect Answer

    Solution

    According to the formula: R = ρ(L/A) where R is resistance, L is length, A is cross-sectional area, and ρ is resistivity. So, resistance increases with length and decreases with area.

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