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Unformatted text preview: Faraday’s Law of
Induction
Induction
Magnetic flux = A B cos B
A A changing magnetic flux
generates an induced voltage
an induced voltage
(emf = electromotive force) = (ABcos )final – (ABcos )initial
(AB
V = [emf] =  N / t
[emf] Motional EMF Voltage induced in a moving
induced in moving
conductor
Velocity Vmax = [emf] = Blv
Length Induced emf depends on angle between
the Magnetic field and the velocity
direction. Lenz’s Law
An induced emf gives rise to a
current whose magnetic field
opposes the original change in
flux new, larger B Induced current Induced B Lenz’s Law Exercises Applications of Faraday’s Law
Eddy Currents
Transformer:
• Primary and secondary coils
and secondary coils
• Iron yoke (to contain flux)
• AC voltages only !
• No loss >
Input power = output power V2
N2
I1
V1 = N1 = I2
Electric Generator: angular
velocity = 2f Alternating (AC) voltage = BAcos(t) t
V
t Electromagnetic Waves 0 0 0 Speed of light (Constant of Nature)
c = 299 792 458 m/s
(3 x 108 m/s)
Also: c = frequency times wavelength
c=f ...
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This note was uploaded on 06/03/2011 for the course PHY 112 taught by Professor Beacom during the Spring '11 term at Ohio State.
 Spring '11
 Beacom
 Physics, Force

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