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NEET Sample Paper NEET Sample Test Paper-49

  • question_answer
    A copper disc of radius 0.1 mis rotated about its centre with 20 revolution per second in a uniform magnetic field of 0.1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is-

    A) \[\frac{\pi }{20}~volt\]              

    B) \[\frac{\pi }{10}~volt\]

    C) \[20~\pi millivolt\]         

    D) \[100\,\,\pi \,\,millivolt\]

    Correct Answer: C

    Solution :

    \[\varepsilon \,\,=\,\,\frac{B\omega {{R}^{2}}}{2}\,\,=\,\,\frac{0.1\,\times \,(2\pi \times 20){{(0.1)}^{2}}}{2}\] \[=\text{ }20\,\pi \,\,\times \,\,{{10}^{-}}^{3}\,volt\]


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