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Phys102 Term: 122 Online HW-Ch030-Lec01 Q1: Faraday’s law states that an induced emf is proportional to: A. B. C. D. E. the rate of change of the magnetic field the rate of change of the electric field the rate of change of the magnetic flux the rate of change of the electric flux zero Ans: 𝐂 Q2: Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5 Wb. If the page is turned by 300 around an edge the flux through it will be: Ans: When the page is perpendicular to the magnetic field the flux is maximum ∅ = ∅0 cos(θ) = 5 cos(30) = 4.3 Wb Q3: A 10-turn conducting loop with a radius of 3.0 cm spins at 60 revolutions per second in a magnetic field of 0.50T. The maximum emf generated is (5.3 V) Ans: ε=N d(BAcos(θ)) d(cos(ωt)) = NBA = NBAωsin(ωt). dt dt For maximum emf sin(ωt) = 1 ε = NBAω = NBπr 2 2πf = 10 × 0.5 × 3.14 × (3 × 10−2 )2 × 2 × 3.14 × 60 = 5.3 V KFUPM-Physics Department 1