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

  • question_answer If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be             [Pb. PET 2001]

    A)            9 : 4                                          

    B)            4 : 3

    C)            3 : 8                                          

    D)            3 : 2

    Correct Answer: D

    Solution :

               \[{{P}_{Rated}}\propto \frac{1}{R}\] Þ \[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{{{P}_{2}}}{{{P}_{1}}}=\frac{60}{40}=\frac{3}{2}\]

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