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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    If a coil of 40 turns and area\[4.0\text{ }c{{m}^{2}}\]is suddenly removed from a magnetic field, it is observed that a charge of\[2.0\times {{10}^{-4}}C\]flows into the coil. If the resistance of the coil is\[80\,\Omega \], the magnetic flux density in\[Wb/{{m}^{2}}\]is .......

    A)  0.5        

    B)                         1.0

    C)  1.5                        

    D)         2.0

    E)  5.5

    Correct Answer: B

    Solution :

    \[q=\frac{N}{R}\phi =\frac{N}{R}(BA)\] \[\Rightarrow \]\[B=\frac{qR}{NA}=\frac{2\times {{10}^{-4}}\times 80}{40\times 4\times {{10}^{-4}}}=1\,Wb/{{m}^{2}}\]


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