Review20 - Modified from College Physics, 7th Ed., Serway,...

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Modified from College Physics , 7 th Ed., Serway, Faughn, and Vuille. For the quizzes and tests, you should know all the concepts and equations in this summary. Section 20.1: Induced emf and Magnetic Flux The magnetic flux through a closed loop is defined as θ cos BA B = Φ [20.1] where B is the strength of the uniform magnetic field, A is the cross-sectional area of the loop, and θ is the angle between B G and a direction perpendicular to the plane of the loop. Section 20.2: Faraday's Law of Induction Faraday's law of induction states that the instantaneous emf induced in a circuit equals the negative of the rate of change of magnetic flux through the circuit, t N B Δ ΔΦ = ε [20.2] where N is the number of loops in the circuit. The magnetic flux can change with time whenever the magnetic field B Φ B G , the area A , or the angle θ changes with time. Lenz's law states that the current from the induced emf creates a magnetic field with flux opposing the change in magnetic flux through a circuit. Section 20.3: Motional emf
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Review20 - Modified from College Physics, 7th Ed., Serway,...

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