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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    A potentiometer has a driving cell of negligible internal resistance. The balancing length of a Daniel cell is 5 m. If the driving cell had internal resistance, the balancing length of the same Daniel cell would have been

    A)  more  

    B)  less

    C)  same

    D)  cannot be said from the data

    Correct Answer: A

    Solution :

     If the primary circuit has some internal resistance, some voltage gets dropped across the internal resistance. So, the voltage drop across the potentiometer wire decreases. As a result the potential gradient\[\left( \frac{V}{L} \right)\]established on the wire decreases. Now,\[V'=Kl\], as \[K\]decreases, \[l\]increases


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