Wikibooks: Electronics/Magnetic Field

• Format: Book
• Language: English
• Subjects: South Pole; South pole
• Online Access: https://en.wikibooks.org/wiki/Electronics/Magnetic_Field

= Magnetic Field B = A magnetic field is generated due to Magnetic moment. Moving charge. Magnets have two poles a north and a south. Like poles repel unlike poles attract. Magnets will try to align their poles. North and south pole pole of earth is reversed geographic north is magnetic south and vice versa. Polarity the alignment of the magnetic field. Magnetic monopole the idea that a single independent pole can exist Pauli exclusion principle Two electrons cannot occupy the same state. Spin quantum property of electrons which gives them intrinsic angular momentum. This means they act as if they were perpetually spinning around their own axis. Permanent dipoles These occur when 2 atoms in a molecule have substantially different electronegativity – one atom attracts electrons more than another becoming more negative while the other atom becomes more positive. See dipole dipole attractions. Instantaneous dipoles These occur due to chance when electrons happen to be more concentrated in one place than another in a molecule creating a temporary dipole. See Instantaneous dipole attraction. Induced dipoles These occur when one molecule with a permanent dipole repels another molecule s electrons inducing a dipole moment in that molecule. See induced dipole attraction. magnetic dipole Analogous to electric dipole. It refers to a magnetic field that looks as if it came from a pair of north and south monopoles infinitesimally close together. magnetic moment (u) The tendency of an object to align itself with a magnetic field. This alignment creates a PE (U). A current carrying loop has a magnetic moment. Electrons and many nuclei have intrinsic magnetic moments due to their quantum spin. The electrons generally come in pairs whose intrinsic magnetic moments cancel but they may still produce a magnetic dipole because they rotate (have orbital angular momentum) or produce a magnetic quadropole because of incomplete cancellation. These intrinsic magnetic moments create some of the macroscopic effects of magnetism such as ...