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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2007

  • question_answer
    In a potentiometer, the null point is received at 7th wire. If now we have to change the null point at 9th wire, what should we do?

    A)  Attach resistance in series with battery

    B)  Increase resistance in main circuit

    C)  Decrease resistance in main circuit

    D)  Decrease applied emf

    Correct Answer: B

    Solution :

     To shift the balance point on higher length, the potential gradient of the wire is to be decreased. The same can be obtained by decreasing the current of the main circuit, which is possible by increasing the resistance in series of potentiometer wire.


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