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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2004

  • question_answer
    A rectangular coil of 300 turns has an average area of \[25\text{ }cm\times 10\text{ }cm\]. The coil rotates with a speed of 50 cps in uniform magnetic field of strength \[4\times {{10}^{-2}}T\]about an axis perpendicular to the field. The peak value of the induced emf is (in volt)

    A)  \[300\,\pi \]                      

    B)  \[3000\,\pi \]

    C)  \[3\,\pi \]                                          

    D)  \[30\,\pi \]

    Correct Answer: D

    Solution :

    Peak value of induced emf in a rectangular coil is \[e=n\,BA\,\,\omega \,\sin \theta \] \[=300\times 4\times {{10}^{-2}}\times (25\times 10\times {{10}^{-4}})\]                                                 \[\times (2\pi \times 50)\times \sin \,{{90}^{o}}\] \[=30\,\,\pi \]volt


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