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Electromagnetic Waves
 Lecture number:
 18
 Pages:
 5
 Type:
 Lecture Note
 School:
 The University of Vermont
 Course:
 Phys 012  Elementary Physics
 Edition:
 1
Documents in this Packet

6 pages

2 pages

Lecture 38 : Length Contraction
1 pages

Lecture 37 : Time Dilation Practice Problems
2 pages

Lecture 36 : Special Relativity
2 pages

2 pages

Lecture 34 : Quantized Electron Orbitals
3 pages

Lecture 33 : WaveParticle Duality of Light and Electrons
4 pages

Lecture 32 : Photoelectric and Compton Effects
3 pages

3 pages

5 pages

Lecture 30 : Particles and Waves
2 pages

Lecture 29 : Single Slit Diffraction and Resolving Power
2 pages

Lecture 28 : Thin Film Interference and Diffraction
2 pages

Lecture 27 : Diffraction and Thin Film Interference
3 pages

Lecture 26 : Diffraction and Interference
4 pages

4 pages

Lecture 24 : Total Internal Reflection
4 pages

Lecture 23 : Refraction of Light
4 pages

4 pages

Lecture 21 : Light Rays and Reflection
3 pages

4 pages

Lecture 20 : In Class Review for Exam 2
2 pages

Lecture 19 : Electromagnetic Spectrum
3 pages

Lecture 17 : Self Inductance, Transformers, and Circuits Containing Inductors
4 pages

3 pages

3 pages

Lecture 14 : Electromagnetic Induction
4 pages

3 pages

Lecture 12 : Currents through Magnetic Fields
3 pages

Lecture 11 : Magnetic Fields and Forces
4 pages

Lecture 10 : Kirchhoff's Rules and RC Circuits
5 pages

5 pages

Lecture 9 : Resistors and Capacitors.
4 pages

Lecture 8 : Electric Currents, Ohm's Law, and
4 pages

Lecture 7 : Capacitors and Dielectrics
3 pages

Lecture 6 : Electric Potential Energy and Electric Potential
4 pages

Lecture 5 : Electric Fields and Forces (18.9,19.1)
3 pages

Lecture 4 : Electric Field Lines
3 pages

2 pages

Lecture 1 : Charge and Charge Transfer
2 pages

2 pages
Unformatted text preview:
Lecture 7 Outline of Last Lecture I. Self inductance constant, L a. Measured in Henrys (H) i. 1 H = 1 (Vs)/A b. Depends on configuration c. For solenoid: L = (N2Aμ0)/l i. εind = L(ΔI/Δt) ii. N (ΔΦ/Δt) = L(ΔI/Δt) ; L = (NΦ)/I iii. Φ = Aμ0(N/l)I II. Energy a. Depends on current b. For solenoid, energy = (AlB2)/2μ0 III. Energy density, μB a. μB = B2/2μ0 i. True for energy density of any magnetic field in free space. IV. RL circuits: circuits with a resistor and an inductor a. Back εmf is generated when I is increasing. No εmf is generated when I is constant. i. I = (ε/R)(1et/τ) 1. τ = time constant = L/R ii. When t = 0, I = 0. iii. As t approaches infinity, I approaches ε/R. Econ 101 1st Edition b. Forward εmf is generated when I is decreasing. i. I = I0et/τ ii. When t = 0, I = I0. iii. As t approaches infinity, I approaches 0. V. Transformers a. Magnetic field will constantly be switching directions, causing a constantly changing flux which generates a continuous εmf. i. Diagram above shows only one direction the magnetic field can be going. ii. The change in flux will be the same in both the primary and secondary circuits. iii. Ip/Is = Vs/Vp = Ns/Np VI. LC Circuits: circuits containing an inductor and a capacitor a. Capacitor is initially fullycharged, causing I to increase. b. Imax is reached when charge on capacitor is zero.
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