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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    In order to balance the Whetstone bridge as shown in the figure, a 100 ohm resistor is to be connected in parallel to one of the existing arms. In which arm of the bridge must the resistor be connected ?

    A)  PQ                                        

    B)  QR  

    C)  PS                         

    D)         RS

    Correct Answer: B

    Solution :

     When the \[100\Omega \] resistor is connected in parallel to\[QR\], its resistance becomes\[\frac{200}{3}\Omega \]. Now the ratio\[QC\], becomes equal to\[\frac{QR}{SR}\].


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