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

  • question_answer Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance \[R=0.5\]ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is             [CBSE PMT 1990; BHU 1997]

    A)            1.28 watt                               

    B)            2.0 watt

    C)            \[\frac{8}{9}\,watt\]         

    D)            3.2 watt

    Correct Answer: B

    Solution :

               \[{{P}_{\max }}=n\,\left( \frac{{{E}^{2}}}{4\,r} \right)=2\,\left( \frac{2\times 2}{4\times 1} \right)=2\,W\]

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