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VMMC VMMC Medical Solved Paper-2014

  • question_answer
    The current-voltage graph for a given metallic wire at two different temperatures \[{{T}_{1}}\]and \[{{T}_{2}}\] is shown in the figure. The temperatures \[{{T}_{1}}\] and \[{{T}_{2}}\] are related as

    A) \[{{T}_{1}}>{{T}_{2}}\]                  

    B) \[{{T}_{1}}<{{T}_{2}}\]

    C) \[{{T}_{1}}={{T}_{2}}\]                  

    D) \[{{T}_{1}}>2{{T}_{2}}\]

    Correct Answer: B

    Solution :

    Slope of the V-i curve at any point is equal to resistance at that point. From the curve slope for \[{{T}_{1}}>\] slope for \[{{T}_{2}}\] \[{{R}_{{{T}_{1}}}}<{{R}_{{{T}_{2}}}}\] \[\Rightarrow \]Also at higher temperature resistance will be higher so\[{{T}_{2}}>{{T}_{1}}.\]


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