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NEET Sample Paper NEET Sample Test Paper-12

  • question_answer
    A voltmeter has a range\[0-V\]with a series resistance R. With a series resistance 2R, the range is\[0-V'.\]The correct relation between V and V? is

    A) \[V'=2V\]                      

    B) \[V'>2V\]

    C) \[V'>>2V\]                   

    D) \[V'<2V\]

    Correct Answer: D

    Solution :

     For conversion of galvanometer (of resistances) into voltmeter, a resistance R is connected in series \[\therefore \]\[{{i}_{g}}=\frac{V}{R+G}\]and \[{{i}_{g}}=\frac{V'}{2R+G}\] \[\Rightarrow \]\[\frac{V}{R+G}=\frac{V'}{2R+G}\] \[\Rightarrow \]\[\frac{V'}{V}=\frac{2R+G}{R+G}=\frac{2(R+G)-G}{(R+G)}\] \[=2-\frac{G}{(R+G)}\Rightarrow V'=2V-\frac{VG}{(R+G)}\Rightarrow V'<2V\]


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