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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2001

  • question_answer
    A voltmeter has a resistance of G ohm and range V volt. The value of resistance used in series to convert it into a voltmeter of range nV volt is

    A)  nG              

    B)  (n-1)G

    C)  \[\frac{G}{n}\]       

    D)  \[\frac{G}{(n-1)}\]

    Correct Answer: B

    Solution :

     \[V={{I}_{g}}(G+R)\] Current in ammeter, \[{{I}_{g}}=\frac{V}{G}\] \[\therefore \] \[\frac{nV}{{{I}_{g}}}=R+G\] \[\Rightarrow \] \[R=\frac{nV}{{{I}_{g}}}-G=G\frac{nV}{V}-G\] \[=G(n-1)\]


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