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JEE Main & Advanced Sample Paper JEE Main Sample Paper-25

  • question_answer
    An immersion heater with electrical resistance \[7\,\Omega \] is immersed in \[0.1\] kg of water at \[{{20}^{o}}C\] for 3 min. If the flow of current is 4A. What is the final temperature of the water in ideal conditions? Specific heat capacity of water \[=4.2\times {{10}^{3}}Jk{{g}^{-1}}{{K}^{-1}}\]

    A)  \[{{28}^{o}}C\]                                 

    B)  \[{{48}^{o}}C\]

    C)  \[{{52}^{o}}C\]                                 

    D)  \[{{68}^{o}}C\]

    Correct Answer: D

    Solution :

    \[{{i}^{2}}RT=ms\Delta T\] \[{{(4)}^{2}}\times 7\times 3\,\times 60=0.1\,\times 4.2\,\times {{10}^{3}}\,\times [T-(20+273)]\] \[T=341\,K={{68}^{0}}C\]


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