Lecture 29a

# Lecture 29a - Chapter 29 Magnetic Fields due to currents A...

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Chapter 29 Magnetic Fields due to currents

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A compass needle always points in the direction of the local magnetic field. If we put a compass near a current-carrying wire, it will A. Not be affected B. Point parallel to the wire C. Point perpendicular to the wire D. Point toward the wire E. Other demo
B Field due to a long straight current-carrying wire

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Calculating B-field due to a current: Biot-Savart law is the permeability constant 2 0 ˆ 4 r r L d i B d dB i dL dL is a short length of wire carrying current i ° 0 = 4± × 10 − 7 T ∙ ݉/² For a long wire 2 0 ˆ 4 r r L d i B d B tot
5 Calculate Magnetic Field from an infinite straight wire. R r dz i z direction q B=? 2 0 ˆ 4 r r L d i B d page) the into ( sin 4 2 0 q r dz i B d 2 2 2 R z r r R / sin Now a little geometry z=0

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6 R r dz i z direction q B=?
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## This note was uploaded on 02/05/2011 for the course PHYS 220B taught by Professor Preminger during the Fall '10 term at CSU Northridge.

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Lecture 29a - Chapter 29 Magnetic Fields due to currents A...

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