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Electromagnetic Induction and Faraday’s Law Physics Department, New York City College of Technology

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Key words Induced emf Induced current Magnetic flux Right hand rule Faraday’s law Lenz’s law

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Induced emf

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Faraday repulsion coil Disc 20 #19 Disc 20 #20

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Magnetic flux Magnetic flux is defined as The unit is Weber (Wb)

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Faraday’s Law If the flux through N loops of wire changes by an amount ΔФ B over a brief time interval Δt, the induced emf is The minus sign indicates in which direction the induced emf acts.

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Lenz’s Law A current produced by an induced emf moves in a direction so that its magnetic filed opposes the original change in flux.

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Example #1 A square coil of 100 loops is pulled at constant speed. It takes 0.1s for the whole coil to reach the field- free region. The coil’s resistance is 100Ω.

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Example #1—continued (a)

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Example #1—continued (b)

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emf induced in a moving conductor

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