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Punjab Medical Punjab - MET Solved Paper-2004

  • question_answer
    In a meter bridge, the balancing length from the left end (standard resistance of \[1\,\,ohm\] in the gap) is found to be\[20\,\,cm\]. The value of the unknown resistance will be:

    A) \[0.25\Omega \]                              

    B) \[0.4\Omega \]

    C) \[0.5\Omega \]                

    D) \[0.8\Omega \]

    Correct Answer: A

    Solution :

    Here: Standard resistance of the wire                    \[=1\Omega \] Length of the wire from the left end                 \[l=20\,\,cm\] The value of unknown resistance is given by,                 \[R=\left( \frac{l}{100-l} \right)\times S\]                     \[=\frac{20}{100-20}\times 1=\frac{20}{80}\]                     \[=0.25\Omega \]


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