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

  • question_answer An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberated in this period of time is                                                         [MP PMT 1996]

    A)            \[7.2\times {{10}^{3}}\,J\]     

    B)            \[14.4\times {{10}^{5}}\,J\]

    C)            \[43.2\times {{10}^{4}}\,J\]   

    D)            \[28.8\times {{10}^{4}}J\]

    Correct Answer: B

    Solution :

               \[H={{i}^{2}}Rt=\frac{{{V}^{2}}t}{R}=\frac{120\times 120\times (10\times 60)}{6}\]\[=14.4\times {{10}^{5}}joule\]

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