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AIIMS AIIMS Solved Paper-2009

  • question_answer
    In an experiment of Wheatstone bridge, a null point is obtained at the centre of the bridge wire. When a resistance of 10\[\Omega \] is connected in one gap, the value of resistance in other gap is

    A) 10\[\Omega \]      

    B)                       5\[\Omega \]                    

    C) \[\frac{1}{2}\Omega \]                 

    D)       500\[\Omega \]

    Correct Answer: A

    Solution :

    According to Wheatstone bridge principle \[\frac{P}{Q}=\frac{R}{S}\] Let length of bridge wire is 100 cm. \[\therefore \]  \[\frac{R}{S}=\frac{l}{100-l}\] Here       \[R=10\Omega ,l=50cm\] \[\frac{10}{S}=\frac{50}{100-50}\] or         \[S=10\Omega \]


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