PHY 101 Lecture Notes - Lecture 11: Electric Field, Voltage, Right-Hand Rule
Document Summary
Recall: magnetic field due to an electric current. Magnetic field due to a long straight wire. A single loop or turn of current-carrying wire creates a magnetic field -- a dipole field (like a bar magnet) Solenoids are a wire that has been coiled into many turns/loops (circular in area). Current flowing through the solenoid creates a uniform magnetic field inside the solenoid. What about materials that seem to have inherent magnetism (no obvious electric current flowing?) Magnetic moment due to the electron"s orbital motion. Atoms like hydrogen can have a magnetic moment due to the orbiting electron current . Electrons have their own intrinsic magnetic moment -- unpaired electrons in an atom contribute to the atoms magnetic moment. Add the two affects up to explain how objects have magnetism. Even though atoms may have a magnetic moment, the atoms in a material can be randomly arranged cancelling each other out.
