JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • question_answer sThe current I vs voltage V graphs for a given metallic wire at two different temperatures \[{{T}_{1}}\] and \[{{T}_{2}}\] are shown in the figure. It is concluded that

    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 :

     R increases with increasing temp: \[V=IR\] Slope of graph \[=\frac{1}{V}=\frac{1}{R};\]. Slope of \[{{T}_{1}}\]is more i.e., \[\frac{1}{{{R}_{1}}}\] is more, hence \[{{R}_{1}}\] is less. This concludes that \[{{T}_{1}}\] will be less than \[{{T}_{2}}\] as \[{{R}_{1}}\]is less than \[{{R}_{2}}\].


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