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18 September, 18:39

Q1. What is the frequency of rotation of 1000 loop coil of area 20cm2 in a magnetic field of 5T to

generate an emf that has a maximum value of 15.7V?

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Answers (1)
  1. 18 September, 20:14
    0
    Emf e generated in a coil with no of turn n and area A rotating in a magnetic field B with angular speed of ω is given by the expression

    e = e₀ sinωt

    where e₀ = nωAB which is the maximum emf generated

    Putting the given values

    15.7 = 1000xω x 20 x 10⁻² x 5

    ω =.0157

    frequency of rotation

    = ω / 2π

    =.0157 / 2 x 3.14

    =.0025 / s

    9 rotation / hour.
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