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BVP Medical BVP Medical Solved Paper-2002

  • question_answer
    Just as electricity is supplied at 220 volts for domestic use in India, it is supplied at110 volts in U.S.A. If the resistance of 60 W bulb for use in India is R , that of 60 W bulb for use in U.S.A., will be :

    A) 2R                                          

    B)  R

    C) RJ2                                        

    D)  R/4

    Correct Answer: D

    Solution :

                    Power of bulb \[P=\frac{{{V}^{2}}}{R}\] \[\frac{{{P}_{india}}}{{{P}_{USA}}}={{\left( \frac{{{V}_{India}}}{{{V}_{USA}}} \right)}^{2}}\left( \frac{{{R}_{USA}}}{{{R}_{India}}} \right)\] \[\left( \frac{60}{60} \right)={{\left( \frac{220}{110} \right)}^{2}}\left( \frac{{{R}_{USA}}}{R} \right)\] \[1=4\left( \frac{{{R}_{USA}}}{R} \right)\] \[{{R}_{USA}}=\frac{R}{4}\]


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