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Chapter 33

Chapter 33. Electromagnetic Induction ( Induced Currents & Motional emf ). 33.1 Induced 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 .

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Chapter 33

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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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