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Punjab Medical Punjab - MET Solved Paper-2010

  • question_answer
    The resistance of a wire at\[{{20}^{o}}C\]is \[20\Omega \] and at \[{{500}^{o}}C\]is\[60\Omega \]. At which temperature its resistance will be\[25\Omega \]?

    A) \[{{50}^{o}}C\]                 

    B) \[{{60}^{o}}C\]

    C) \[{{70}^{o}}C\]                 

    D) \[{{80}^{o}}C\]

    Correct Answer: D

    Solution :

    Use        \[{{R}_{t}}={{R}_{0}}(1+\alpha t)\] Here      \[20={{R}_{0}}(1+20\alpha )\]                 \[60{{R}_{0}}(1+500\alpha )\] Here      \[{{R}_{t}}=25\Omega \] On solving, we find\[t={{80}^{o}}C\]


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