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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2010

  • question_answer
    A moving coil galvanometer has 48 turns and area of coil is \[4\times {{10}^{-2}}{{m}^{2}}\]. If the magnetic field is 0.2 T, then to increase the current sensitivity by 25% without changing area (A) and field (B) the number of turns should become

    A)  24                                         

    B)  36

    C)  60                         

    D)         54

    Correct Answer: C

    Solution :

    As we know Current sensitivity\[{{S}_{i}}=\frac{NBA}{C}\] \[\Rightarrow \]               \[{{S}_{i}}\propto N\Rightarrow \frac{{{({{S}_{i}})}_{1}}}{{{({{S}_{i}})}_{2}}}=\frac{{{N}_{1}}}{{{N}_{2}}}\] \[\Rightarrow \]               \[\frac{100}{125}=\frac{48}{{{N}_{2}}}\Rightarrow {{N}_{2}}=60\]


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