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JCECE Medical JCECE Medical Solved Paper-2011

  • question_answer
    A coil has an area of \[0.05\,{{m}^{2}}\]and has 800 turns. After placing the coil in a magnetic field of strength\[4\times {{10}^{-5}}Wb{{m}^{-2}}\]perpendicular to the field, the coil is rotated through \[{{90}^{o}}\] in 0. Is. The average emf induced is

    A)  zero             

    B)  0.016V

    C)  0.01V        

    D)  0.032V

    Correct Answer: B

    Solution :

     Induced emf\[e=\frac{d\text{o }\!\!|\!\!\text{ }}{dt}=\frac{NAdB}{dt}\] \[=800\times 0.05\times \frac{4\times {{10}^{-5}}}{0.1}\] \[=0.016\,V\]


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