MGIMS WARDHA MGIMS WARDHA Solved Paper-2011

  • question_answer
    An electric heater of resistance 6H works for 10 min on a 60 V line. The energy liberated in this period of time is

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

    B)  \[3.6\times {{10}^{s}}J\]

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

    D)  \[28.8\times {{10}^{4}}J\]

    Correct Answer: B

    Solution :

                     Heat produced, \[H=\frac{{{V}^{2}}}{R}t\] \[=\frac{60\times 60}{6}\times 10\times 60\] \[=3.6\times {{10}^{5}}J\]


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