Electromagnetic Induction

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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.

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The University of Vermont
Phys 012 - Elementary Physics
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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 10-7 (T*m)/A c. Right hand rule for magnetic field about a current-carrying 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 current-carrying 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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