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

  • question_answer If  current in an electric bulb changes by 1%, then the power will change by                                         [AFMC 1996]

    A)            1% 

    B)            2%

    C)            4% 

    D)            \[\frac{1}{2}%\]

    Correct Answer: B

    Solution :

                       \[P={{i}^{2}}R\]  Þ \[\frac{\Delta P}{P}=\frac{2\Delta i}{t}\]   (R ® Constant) Þ % change in power \[=2\times \]% change in current                                     =\[2\times 1=2%\]

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