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

  • question_answer A resistor \[{{R}_{1}}\] dissipates the power P when connected to a certain generator. If the resistor \[{{R}_{2}}\] is put in series with \[{{R}_{1}}\], the power dissipated by \[{{R}_{1}}\]      [CPMT 1985; MNR 1998]

    A)            Decreases

    B)            Increases

    C)            Remains the same             

    D)            Any of the above depending upon the relative values of \[{{R}_{1}}\] and \[{{R}_{2}}\]

    Correct Answer: A

    Solution :

               Equivalent resistance in the second case \[={{R}_{1}}+{{R}_{2}}=R\] Now, we know that \[P\propto \frac{1}{R}\] Since in the second case the resistance \[({{R}_{1}}+{{R}_{2}})\]is higher than that in the first case (R1). Therefore power dissipation in the second case will be decreased.

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