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4 March, 19:15

ncreasing the frequency of rotation of the coils in an electrical generator increases the output emf. urn coil with a 0.250 m2 area is spun in the Earth's 5.00*10-5T field, producing a 12.0 kV maximum emf. At what angular velocity must the coil be spun?

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  1. 4 March, 19:27
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    The question is incomplete. The complete question is:

    A 500-turn coil with a 0.250 m2 area is spun in the Earth's 5.00 * 10-5 T field, producing a 12.0 kV maximum emf. (a) At what angular velocity must the coil be spun? (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

    Answer:

    ω=1.92 * 106 rad/s

    Explanation:

    Emfo = 12.0*10^3 V

    N = 500 turns

    A = 0.250 m^2

    B = 5.00*10^-5

    ω=?

    From

    Emfo = NABω

    ω = Emfo/NAB

    ω = 12.0*10^3/500*0.250*5.00*10^-5

    ω=1.92 * 106 rad/s

    b) This angular velocity is unreasonably high, it is very much higher than a value that can be obtained for any mechanical system.

    c) The unreasonable assumption or premise that a peak voltage as high as 12.0kV may be obtained.
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