Answers
Given,
= Current I = e / R
= e = induced emf
= R = total resistance = 61.9 + 46.3 = 108.2 Ω
Area A = 3.26cm^2 = 3.26 * 10^-4 m^2
Then,
= dQ / dt = ( - dφ/dt) / R
= dQ = - dφ / R
= - N * A * ΔB / R
Then,
Let the initial magnetic field = B
The final magnetic field = 0
So,
= dQ = 3.46 * 10^-5 = - 145 * 3.26 * 10^-4 * (0 - B) / 108.2
= 3.46 * 10^-5 = 4.36 * 10^-4 * B
= B = 3.46 * 10^-5 / 4.36 * 10^-4
= 0.0793 T
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