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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2004

  • question_answer
    A rectangular coil of 300 turns has an average area of\[25cm\times 10cm\]. 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 \[e=nBA\omega \sin \theta \] \[=300\times 4\times {{10}^{-2}}\times (25\times 10\times {{10}^{-4}})\]\[\times (2\pi \times 50)\times sin{{90}^{o}}\] \[=30\pi \,volt\]


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