|DEMONSTRATION: Field Lines of Bar Magnets|
|The Electric Dipole||The Bar Magnet|
+ charge: source of electric field lines
- charge: sink of electric field lines
Magnetic field lines cannot stop or start,
but must close on themselves.
Notice the similarity in field line structure between the bar magnet and electric dipoles.
However there is one important difference: There are no magnetic monopoles observed!
At this point in the course we have now uncovered the first two of Maxwell's equations.
|Gauss's Law:||For Magnetism:|
|DEMONSTRATION: Deflection of Electron Beam in CRT with Magnetic Field|
Discussion of right-hand rule for finding direction of cross product.
Last updated April 7, 1998.
Copyright George Watson, Univ. of Delaware, 1997.