JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Critical Thinking

  • question_answer
    If a wire of resistance \[20\,\Omega \] is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is                                               [AFMC 1997]

    A)            \[0.85\,g/s\]                         

    B)            \[1.92\,g/s\]

    C)            \[6.56\,g/s\]                         

    D)            All of these

    Correct Answer: C

    Solution :

                       \[H=\frac{{{V}^{2}}}{R}\times t=\frac{{{(210)}^{2}}}{20}\times 1=mL\]            \ \[\frac{{{(210)}^{2}}}{20}=m\times 80\times 4.2\]            Þ \[m=6.56\,\,g/s\,\]


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