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WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    If a coil of 40 turns and area \[\text{40}\,\text{c}{{\text{m}}^{\text{2}}}\] 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 \[\text{Wb/}{{\text{m}}^{\text{2}}}\] is .......

    A)  0.5                                        

    B)  1.0

    C)  1.5                                        

    D)  2.0

    Correct Answer: B

    Solution :

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


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