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Electromagnetic Induction
In this lecture we started chapter 22 on electromagnetic induction. We covered induced currents, magnetic flux, and Faraday's Law.
 Lecture number:
 14
 Pages:
 4
 Type:
 Lecture Note
 School:
 The University of Vermont
 Course:
 Phys 012  Elementary Physics
 Edition:
 1
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Lecture 34 : Quantized Electron Orbitals
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Lecture 32 : Photoelectric and Compton Effects
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Lecture 30 : Particles and Waves
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Lecture 28 : Thin Film Interference and Diffraction
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Lecture 27 : Diffraction and Thin Film Interference
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Lecture 26 : Diffraction and Interference
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Lecture 24 : Total Internal Reflection
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Lecture 23 : Refraction of Light
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Lecture 21 : Light Rays and Reflection
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Lecture 17 : Self Inductance, Transformers, and Circuits Containing Inductors
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Lecture 12 : Currents through Magnetic Fields
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Lecture 11 : Magnetic Fields and Forces
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Lecture 9 : Resistors and Capacitors.
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Lecture 8 : Electric Currents, Ohm's Law, and
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Lecture 7 : Capacitors and Dielectrics
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Lecture 6 : Electric Potential Energy and Electric Potential
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Lecture 4 : Electric Field Lines
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Unformatted text preview:
Lecture 14 Outline of Last Lecture II. Ampere’s Law a. Analogous to Gauss’s Law, but for magnetic fields instead of electric fields b. ΣBΔlcosθ = μ0Ienc. i. Δl = length around the surface that you are measuring ii. μ0 = permeability of free space = 4π x 107 (T*m)/A c. Right hand rule for magnetic field about a currentcarrying wire i. Point thumb in direction of current ii. Fingers will curl pointing toward direction of magnetic field d. B is weaker with greater r (magnetic field strength decreases with greater distance from source) i. Around a circle about a long, straight currentcarrying wire: 1. ΣBΔlcosθ = μ0Ienc. 2. BΣΔl = μ0Ienc. (B always perpendicular to r so cosθ = 1; B is constant so ΣB = B) 3. B(2πR) = μ0Ienc. (total length around circle [Δl] = 2πR) 4. B = (μ0Ienc.)/2πR e. For a circular, solenoid coil, B = (μ0Ienc.N)/L or μ0nIenc. (where n = N/L) i. N = number of wraps around the coil ii. L = length of coil iii. B will point straight through coil at center of concentric circles f. At the center of a circular current, B = (μ0I)/2r. Physics 012 1st Edition
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