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18 September, 17:38

A 0.65-T magnetic field is perpendicular to a circular loop of wire with 73 turns and a radius of 18 cm. If the magnetic field is reduced to zero in 0.12 s, what is the magnitude of the induced emf?

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  1. 18 September, 18:04
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    40.25 V

    Explanation:

    Parameters given:

    Initial magnetic field, B1 = 0.65 T

    Final magnetic field, B2 = 0 T

    Number of turns, N = 73

    Radius of loop, r = 18 cm = 0.18 m

    Time taken, Δt = 0.12 s

    The magnitude of the EMF induced in a loop of wire due to a changing magnetic field is given as:

    V = | [-N * A * (B2 - B1) ] / Δt |

    Where A = area of loop

    Area of loop = πr²

    Therefore, the magnitude of the EMF induced will be:

    V = | [-N * πr² * (B2 - B1) ] / Δt |

    V = | [-73 * π * 0.18² * (0 - 0.65) ] / 0.12 |

    V = |40.25| V

    V = 40.25 V

    This is the magnitude of the EMF induced in the loop of wire.
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