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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2011

  • question_answer
    The deflection in a moving coil galvanometer is reduced to half when it is shunted with a \[40\,\Omega \] coil. The resistance of the galvanometer is

    A)  \[80\,\Omega \]                             

    B)  \[40\,\Omega \]

    C)  \[20\,\Omega \]                             

    D)  \[15\,\Omega \]

    Correct Answer: B

    Solution :

    We know,           \[\frac{{{I}_{G}}}{I}=\frac{1}{2}\]                 \[\frac{S}{G+S}=\frac{1}{2}\]                 \[\frac{{{I}_{G}}}{I}=\frac{40}{G+40}=\frac{1}{2}\]                                 \[G=40\,\Omega \]


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