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

  • question_answer  If two electric bulbs have 40W and 60W rating at \[220V\], then the ratio of their resistances will be [BHU 1999; KCET 2001]

    A)            3 : 2                                          

    B)            2 : 3

    C)            3 : 4                                          

    D)            4 : 3

    Correct Answer: A

    Solution :

               \[P=\frac{{{V}^{2}}}{R}\Rightarrow \] \[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{{{P}_{2}}}{{{P}_{1}}}=\frac{60}{40}=\frac{3}{2}\]

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