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NEET Sample Paper NEET Sample Test Paper-31

  • question_answer
    The emf of a cell is balanced at 60 cm length of the potentiometer wire. If 3 ohm resistance is inserted from the resistance box connected with the cell, then balancing length obtained is 30 cm. The internal  resistance of the cell will be :-

    A)  \[1.5\]ohm

    B)  \[2.0\]ohm

    C)  \[1.8\]ohm                  

    D)  \[3.0\]ohm                             

    Correct Answer: D

    Solution :

    \[r=\left( \frac{{{\ell }_{0}}-{{\ell }_{c}}}{{{\ell }_{c}}} \right)R=\left( \frac{60-30}{30} \right)3=3\Omega \]            


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