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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2011

  • question_answer
        In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of\[2\,\Omega \] the balancing length becomes 120 cm. The internal resistance of the cell is

    A)  \[4\,\Omega \]               

    B)  \[2\,\Omega \]

    C)  \[1\,\Omega \]                               

    D)  \[0.5\,\Omega \]

    Correct Answer: B

    Solution :

                    Here,   \[r=\frac{{{l}_{1}}-{{l}_{2}}}{{{l}_{2}}}\times 2\] \[=\frac{240-120}{120}\times 2\] \[=\frac{120}{120}\times 2=2\,\Omega \]


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