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Faraday's Discovery of Induced Currents: Key Experiments & Findings

Explore Michael Faraday's 1831 discoveries on induced currents through experiments with coils, magnets, and B-fields, leading to the understanding that current is generated when the magnetic field changes. Discover the fascinating moments of induction and learn the foundational principles of electromagnetic induction.

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Faraday's Discovery of Induced Currents: Key Experiments & Findings

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  1. Chapter 33 Electromagnetic Induction (Induced Currents & Motional emf)

  2. 33.1Induced Currents Michael Faraday’s discovery of 1831.. • When one coil is placed directly above another, there is NO current in the lower circuit while the switch is in the closed position. • A momentary current appears whenever the switch is opened or closed.

  3. 33.1Induced Currents Michael Faraday’s discovery of 1831.. • When a bar magnet is pushed into a coil of wire, it causes a momentary deflection of the current-meter needle. • Holding the magnet inside the coil has NO effect. • A quick withdrawal of the magnet deflects the needle in the other direction.

  4. 33.1Induced Currents Michael Faraday’s discovery of 1831.. • A momentary current is produced by rapidly pulling a coil of wire out of a B-field. • Pushing the coil into the magnet causes the needle to deflect in the opposite direction.

  5. 33.1Induced Currents Michael Faraday’s discovery of 1831.. Take home message: Faraday found that there IS a current in a coil of wire if and only if the B-field passing through the coil is changing!

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