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MGIMS WARDHA MGIMS WARDHA Solved Paper-2009

  • question_answer
    A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of\[10\Omega .\] If a length of 50 cm of the potentiometer wire is required to get the null points the current passing through 10\[\Omega \]resistor is (in mA)

    A)  1                                            

    B)  2

    C)  5                                            

    D)  10

    Correct Answer: D

    Solution :

                     \[V=IR=xl\] \[\Rightarrow \] \[I\times 10\left[ \frac{2\times {{10}^{-3}}}{{{10}^{-2}}} \right]\times 50\times {{10}^{-2}}=0.01\] \[I=10\times {{10}^{-3}}A=10\,mA\]


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