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

  • question_answer A steel wire has a resistance twice that of an aluminium wire. Both of them are connected with a constant voltage supply. More heat will be dissipated in            [Roorkee 1999]

    A)            Steel wire when both are connected in series

    B)            Steel wire when both are connected in parallel

    C)            Aluminium wire when both are connected in series

    D)            Aluminium wire when both are connected in parallel

    Correct Answer: D

    Solution :

     \[{{R}_{steel}}=2{{R}_{Al}}\]. In series \[H\propto R\] (i  is Same) So, \[H\] will be more in steel wire . In parallel \[H\propto \frac{1}{R}\] (V is Same), so H will be more in aluminium wire.

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