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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    In a potentiometer experiment for measuring the emf of a cell, the null point is at 480cm when we have a 4000 resistor in series with the cell and galvanometer. If the series resistances is reduced to half, the null point will be at

    A)  120 cm                                

    B)  240 cm

    C)  480 cm                                

    D)  600 cm

    Correct Answer: C

    Solution :

                    At null point, no current flows through galvanometer. Therefore, the resistance connected in series with galvanometer, at null point position will be in effective. Thus, null point is obtained on potentiometer wire at the original position after the removal of series resistance from galvanometer.


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