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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    A voltmetre of range 2 V and resistance 300\[\Omega \] cannot be converted into ammeter of range

    A)  1 A                                        

    B)  1 mA

    C)  100 mA               

    D)  10 mA

    Correct Answer: B

    Solution :

                    \[{{I}_{g}}=\frac{2}{300}A\]      \[=\frac{2}{300}\times 1000\,mA=\frac{20}{3}mA\] \[{{I}_{g}}=6.67\,m{{A}^{\,TM}}\] Its range of ammeter cannot be decreased but can be increased only, therefore, the instrument cannot be converted to measure the range 1 mA.


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