####
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* = (cos*θ*_{1} - cos*θ*_{2}) |

**
Formula for the magnetic field strength inside an infinite solenoid
** | *B* = |