A coil is placed perpendicular to a magnetic field of 5000 T. When the field is changed to 3000 T in 2 s, an induced emf of 22 V is produced in the coil. If the diameter of the coil is 0.02 m, then the number of turns in the coil is:
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Question

A coil is placed perpendicular to a magnetic field of 5000 T. When the field is changed to 3000 T in 2 s, an induced emf of 22 V is produced in the coil. If the diameter of the coil is 0.02 m, then the number of turns in the coil is:

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G1 Physics · Accepted Answer

ε = N(ΔΦ/Δt) ΔΦ = ΔB · A = (5000 - 3000)π(0.01)² = 0.2π Wb 22 = N(0.2π/2) Using π ≈ 22/7: N = 70