
Second Right Hand Rule
Rule that gives the direction of the magnetic field about a currentcarrying wire

Solenoid
A long, helical coil of wires
Terms
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 = 