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PHYSICS 120 Lab #6 - Faraday’s Law of Induction

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PHYSICS 120 Lab #6 - Faraday’s Law of Induction.ntroduction Faraday’s Law of induction, one of the 4 essential laws of classical electromagnetism, demonstrates how magnetic fields interact with ... electric circuits. Named after the one who discovered it in 1831, it essentially states that a circuit of comprising an area A which experiences a time-varying magnetic field B produces an emf: ℇ = − ∆(Φ? ) Δ? where Φ corresponds to the magnetic flux, and is equal to: ? Φ ? = ? • ? • ???θ Thus, the emf can be produced by changing the magnetic field (the magnitude or direction) or the area of the circuit. If the circuit comprises N turns of a coil, then the area A would be replaced by N * A. This emf induces a current in a circuit, which in turn creates its own magnetic field. But what direction does this current flow? Simply put, the current will always flow in such a way that the induced magnetic field opposes the original change in flux. The principle of induction - that a changing magnetic field can produce a current - has far-reaching applications in everyday society. Transformers use the fact that a primary coil containing a time-varying current can induce a current in an adjacent secondary coil, allowing for the wireless transmission of energy, as well as stepping up and down voltages from power stations to homes. In addition, mechanically rotating a coil around a stationary magnet (or vice versa) produces induced currents in the coil, leading to the generation of electricity [Show More]

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