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Sources of Magnetic Fields

Terms and Formulae

Introduction and Summary

Fields of Permanent Magnets and Straight Wires

Terms

Second Right Hand Rule  -  Rule that gives the direction of the magnetic field about a current-carrying wire
Solenoid  -  A long, helical coil of wires

Formulae

 
Formula for the magnetic field around a straight wire B =
 
Equation for the force, per unit charge, between two parallel current carrying wires =
 
Formula for the contribution by a small length of wire, dl , to the magnetic field at a given point dB =
 
Equation for the strength of the magnetic field on the axis of a ring B =
 
Equation for the strength of the magnetic field at the center of a ring B =
 
Formula for the magnetic field strength on the axis of a solenoid B = (cosθ 1 - cosθ 2)
 
Formula for the magnetic field strength inside an infinite solenoid B =

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