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16 December, 19:33

The magnetic field in a solenoid is. A circular wire of radius 8 cm is concentric with a solenoid of radius 2 cm and length d = 2 meter, containing 12000 turns. The current increases at a rate of 40 A/s. What is the emf in the wire?

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  1. 16 December, 20:15
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    6.03 mV

    Explanation:

    length of solenoid, L = 2 m, N = 12000, di/dt = 40 A/s,

    Magnetic field due to solenoid

    B = μ0 n i = μ0 N i / L

    dB/dt = μ0 N / L x di / dt

    dB / dt = (4 x 3.14 x 10^-7 x 12000 x 40) / 2 = 0.3 T/s

    Induced emf, e = rate of change of magnetic flux

    e = dΦ / dt = A x dB / dt

    e = 3.14 x 0.08 x 0.08 x 0.3 = 6.03 x 10^-3 V = 6.03 mV
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