# ch22 - Chapter 22 Electromagnetic Induction 22.1 Induced...

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Chapter 22 Electromagnetic Induction

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22.1 Induced Emf and Induced Current There are a number of ways a magnetic field can be used to generate an electric current. It is the changing field that produces the current.
22.1 Induced Emf and Induced Current The current in the coil is called the induced current because it is brought about by a changing magnetic field. Since a source emf is always needed to produce a current, the coil behaves as if it were a source of emf. This emf is known as the induced emf.

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22.1 Induced Emf and Induced Current An emf can be induced by changing the area of a coil in a constant magnetic field In each example, both an emf and a current are induced because the coil is part of a complete circuit. If the circuit were open, there would be no induced current, but there would be an induced emf. The phenomena of producing an induced emf with the aid of a magnetic field is called electromagnetic induction.
22.2 Motional Emf THE EMF INDUCED IN A MOVING CONDUCTOR Each charge within the conductor is moving and experiences a magnetic force qvB F = The separated charges on the ends of the conductor give rise to an induced emf, called a motional emf.

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22.2 Motional Emf vBL = E Motional emf when v, B, and L are mutually perpendicular
22.2 Motional Emf Example 1 Operating a Light Bulb with Motional Emf Suppose the rod is moving with a speed of 5.0m/s perpendicular to a 0.80-T magnetic field. The rod has a length of 1.6 m and a negligible electrical resistance. The rails also have a negligible electrical resistance. The light bulb has a resistance of 96 ohms. Find (a) the emf produced by the rod and (b) the current induced in the circuit.

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22.2 Motional Emf (a) ( 29 ( 29 ( 29 V 4 . 6 m 6 . 1 T 80 . 0 s m 0 . 5 = = = vBL E A 067 . 0 96 V 4 . 6 = = = R I E (b)
22.2 Motional Emf MOTIONAL EMF AND ELECTRICAL ENERGY In order to keep the rod moving at constant velocity, the force the hand exerts on the rod must balance the magnetic force on the current: ILB F F = = hand

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22.2 Motional Emf The direction of the force in this figure would violate the principle of conservation of energy.
22.2 Motional Emf Conceptual Example 3 Conservation of Energy

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• Summer '09
• Uscinski
• EMF, Magnetic Field, Electromagnetic induction, Faraday's law of induction, Law of Electromagnetic Induction

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ch22 - Chapter 22 Electromagnetic Induction 22.1 Induced...

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