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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1995

  • question_answer
    In potentiometer experiment a battery of e.m.f. 3 volt is balanced at a length of 45 cm and e.m.f. of another battery balance at 60 cm length. Then e.m.f. of the battery is:

    A)  3 volt                   

    B)                         4 volt

    C)         4.5 volt                               

    D)                                         6 volt

    Correct Answer: B

    Solution :

    For potentiometer \[\frac{{{V}_{1}}}{{{V}_{2}}}=\frac{{{l}_{1}}}{{{l}_{2}}}\] \[\frac{V}{3}=\frac{60}{45}\]  \[\Rightarrow \] \[V=4\] volt


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