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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Different Measuring Instruments

  • question_answer
    An ammeter whose resistance is \[180\,\Omega \] gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is                                                                       [EAMCET (Engg.) 1995]

    A)                    18

    B)                                      20

    C)                    0.1                                    

    D)            10

    Correct Answer: B

    Solution :

                 Given \[{{i}_{g}}=2mA,\] \[i=20mA,\,G=180\Omega \] \[\frac{{{i}_{g}}}{i}=\frac{S}{G+S}\] Þ \[180+S=10S\] Þ \[S=\frac{180}{9}=20\Omega \]


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