RAJASTHAN PMT Rajasthan - PMT Solved Paper-2010

  • question_answer
    A moving coil galvanometer has a resistance of \[50\Omega \] and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1 A?

    A)  \[50/99\,\Omega \] in series     

    B)  \[50/99\,\Omega \] in parallel

    C)  \[0.01\,\Omega \] in series

    D)  \[0.01\,\Omega \] in parallel

    Correct Answer: B

    Solution :

    \[S=\frac{{{i}_{g}}\times G}{i-{{i}_{g}}}=\frac{10\times {{10}^{-3}}\times 50}{1-{{10}^{-3}}\times 10}\]                     \[=\frac{50}{99}\Omega \]in parallel


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