JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors Question Bank Heating Effect of Current

  • question_answer A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be                                   [MNR 1998]

    A)            Zero                                         

    B)            \[10\,\Omega \]

    C)            \[1\,\Omega \]                   

    D)            \[0.10\,\Omega \]

    Correct Answer: D

    Solution :

               \[P={{i}^{2}}R\] Þ \[22.5={{(15)}^{2}}\times R\]Þ \[R=0.10\,\,\Omega \]

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