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JEE Main & Advanced Physics Mathematical Tools, Units & Dimensions Question Bank Self Evaluation Test - Physical World, Units and Measurements

  • question_answer
    A thin copper wire of length / metre increases in length by 2% when heated through\[10{}^\circ C\]. What is the percentage increase in area when a square copper sheet of length / metre is heated through \[10{}^\circ C?\]

    A) 4%

    B)  8%

    C)  16%

    D)  None of these

    Correct Answer: A

    Solution :

    [a] Since percentage increase in length =2% Hence, percentage increase in area of square \[2\times 2%=4%\]


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