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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2011

  • question_answer
        In the combination of resistance shown in the figure, the potential difference between B and D, is zero, when unknown resistance is

    A)  \[0.125\,\Omega \]                       

    B)  \[2\,\Omega \]

    C)  \[3\,\Omega \]

    D)  for finding the value of\[X,\]the emf of cell is required

    Correct Answer: A

    Solution :

                    If is a balanced Wheatstone bridge Hence,       \[\frac{P}{R}=\frac{Q}{X}\] Here,   \[P=12+4=16\,\Omega \]                 \[Q=1+3=4\,\Omega \]                 \[R=\frac{1}{2}\,\Omega \] So,          \[\frac{16}{0.5}=\frac{4}{X}\]                 \[X=0.125\,\Omega \]


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