JIPMER Jipmer Medical Solved Paper-1998

  • question_answer
    A galvanometer of 100\[\Omega \] resistance gives full scale deflection with 0.01 A current. How much resistance should be connected to convert it into an ammeter of range ,   10 A :

    A)  0.1 \[\Omega \] in parallel

    B)  0.1 \[\Omega \] in series

    C)                         0.2 \[\Omega \] in parallel

    D)        0.2 \[\Omega \] is series

    Correct Answer: A

    Solution :

                   Here: resistance of galvanometer\[G=100\,\Omega \] Maximum current across galvanometer \[{{I}_{g}}=0.01A\] Current range in ammeter = 10 A Since, the shunt resistance should be connected in parallel to convert the galvanometer into an ammeter.                                 \[S=\left( \frac{{{I}_{g}}}{I-{{I}_{g}}} \right)G=\left[ \frac{0.01}{(10-0.01)} \right]\times 100\]   \[=0.1\,\Omega \]


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