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NTSE Sample Paper NTSE SAT Practice Test-20

  • question_answer
    Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio

    A) 1 : 1                             

    B) 1 :2

    C) 2: 1                  

    D) 4:1

    Correct Answer: C

    Solution :

    [c] \[{{P}_{1}}\,\propto \frac{1}{R}\] and \[{{P}_{2}}\,\propto \frac{1}{2R},\] for the same potential as they are in parallel \[\therefore \,\,\,\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{2R}{R}=\frac{2}{1}\]


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