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

  • question_answer If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,                   [BCECE 2004]

    A)            2 : 1                                          

    B)            1 : 2

    C)            2 : 9                                          

    D)            9 : 2

    Correct Answer: C

    Solution :

                       Heat \[H=\frac{{{V}^{2}}t}{R}\] Þ \[H\propto \frac{1}{R}\]           (If V, t constant) Þ \[\frac{{{H}_{S}}}{{{H}_{P}}}=\frac{{{R}_{P}}}{{{R}_{S}}}=\frac{\left( \frac{R\times 2R}{3R} \right)}{(R+2R)}=\frac{2}{9}\]

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