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Unformatted text preview: Chapter 28 – Sources of Magnetic Field Magnetic Field of a Moving Charge Magnetic Field of a Current Element Magnetic Field of a Straight CurrentCarrying Conductor Force Between Parallel Conductors Magnetic Field of a Circular Current Loop Ampere’s Law Applications of Ampere’s Law Magnetic Materials 1. Magnetic Field of a Moving Charge A charge creates a magnetic field only when the charge is moving. Source point: location of the moving charge. Field point: point P where we want to find the field. 2 sin 4 r v q B ϕ π μ = Magnetic field from a point charge moving with constant speed μ = 4 π ·107 Wb/A·m = N s 2 /C 2 = N/A 2 = T m/A (permeability of vacuum) c = (1/ μ ε ) 1/2 b speed of light Magnetic field of a point charge moving with constant velocity 2 ˆ 4 r r v q B × = a a π μ = vector from source to field point r r r / ˆ a = Moving Charge: Magnetic Field Lines direction of v. Your fingers curl around the charge in direction of magnetic field lines. The magnetic field lines are circles centered on the line of v and lying in planes perpendicular to that line....
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This note was uploaded on 07/30/2011 for the course PHY 2049 taught by Professor Saha during the Spring '08 term at University of Central Florida.
 Spring '08
 SAHA
 Physics, Charge, Current, Force

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