AFMC AFMC Solved Paper-2010

  • question_answer
    A galvanometer of resistance 15\[\Omega \] gives full scale deflection for a current of 2 mA. Calculate the shunt resistance needed to convert it into an ammeter of range 5A

    A) 0.178\[\Omega \]                           

    B) 0.002\[\Omega \]

    C) 0.0060\[\Omega \]                                         

    D) 5\[\Omega \]

    Correct Answer: C

    Solution :

    Resistance of shunt needed to convent it into ammeter is \[S=\frac{{{I}_{g}}G}{I-{{I}_{g}}}\] \[=\frac{2\times {{10}^{-3}}\times 15}{5-2\times {{10}^{-3}}}=0.006\,\Omega \]


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