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Transcript
Chapter 37: Electromagnetic Induction Conceptual Physics 37.1 Electromagnetic Induction Electromagnetic Induction: The phenomenon of inducing voltage by changing the magnetic field around the conductor. 37.2 Faradayβs Law Electromagnetic induction can be summarized in a statement that is called Faradayβs Law: The induced voltage in a coil is proportional to the product of the number of loops and the rate at which the magnetic field changes within these loops. 1 37.3 Generators and Alternating Current http://www.animations.physics.unsw.edu.au/jw/electricmotors.html 37.4 Motor and Generator Comparison 2 The relationship between primary and secondary voltages with respect to the relative number of turns is πππππππ¦ π£πππ‘πππ π ππππππππ¦ π£πππ‘πππ = ππ’ππππ ππ πππππππ¦ π‘π’πππ ππ’ππππ ππ π ππππππππ¦ π‘π’πππ πππ€ππ πππ‘π πππππππ¦ = πππ€ππ ππ’π‘ ππ π ππππππππ¦ 37.7 Induction of Electric and Magnetic Fields Faradayβs Law: An electric field is created in any region of space in which a magnetic field is changing with time. The magnitude of the created electric field is proportional to the rate at which the magnetic field changes. The direction of the created electric field is at right angles to the changing magnetic field. Maxwellβs Law A magnetic field is created in any region of space in which an electric fields is changing with time. The magnitude of the created magnetic field is proportional to the rate at which the electric field changes. The direction of the created magnetic field is at right angles to the changing electric field. 37.8 Electromagnetic Waves 3 4