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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2008

  • question_answer
    Two tangent galvanometers A and B are identical except in their number of rums. They are connected in series. On passing a current through them, deflections of \[{{60}^{o}}\] and \[{{30}^{o}}\] are produced. The ratio of the number of rums in A and B is

    A)  \[1:3\]                                 

    B)  \[3:1\]

    C)  \[1:2\]                                 

    D)  \[2:1\]

    Correct Answer: B

    Solution :

    As the current and the other factors are same for both the galvanometers                 \[N\propto \tan \theta \]                 \[\frac{{{N}_{1}}}{{{N}_{2}}}=\frac{\tan {{60}^{o}}}{\tan {{30}^{o}}}\]                 \[=\frac{\sqrt{3}}{1/\sqrt{3}}\] \[\Rightarrow \]               \[\frac{{{N}_{1}}}{{{N}_{2}}}=3\]


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