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NEET Sample Paper NEET Sample Test Paper-25

  • question_answer
    A magnetic field of \[2\times {{10}^{-2}}\,T\]acts at right angles to a coil of area\[100\,c{{m}^{2}}\]with 50 turns. The average emf induced in the coil is 0.1 V, when it is removed from the field in time t. The value of / is

    A)  0.1 sec

    B)  0.01 sec

    C)  1 sec

    D)  20 sec

    Correct Answer: A

    Solution :

    \[e=-\frac{N({{B}_{2}}-{{B}_{1}})A\,\cos \theta }{\Delta t}\] \[\Rightarrow \]\[0.1=\frac{-50\times (0-2\times {{10}^{-2}})\times 100\times {{10}^{-4}}\times \cos {{0}^{o}}}{t}\] \[\Rightarrow \]\[t=0.1\,\sec .\]


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