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

  • question_answer If in the circuit, power dissipation is 150 W, then R is [AIEEE 2002]

    A)            2 W

    B)            6 W

    C)            5 W

    D)            4 W

    Correct Answer: B

    Solution :

                       \[P=\frac{{{V}^{2}}}{{{R}_{eq}}}\Rightarrow 150=\frac{{{(15)}^{2}}}{[2R/(R+2)]}=\frac{225\times (R+2)}{2R}\] Þ \[R=\frac{450}{75}=6\Omega \].

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