Similarities between magnetic fields and electric fields:
- Electric fields are produced by two kinds of charges, positive
and negative. Magnetic fields are associated with two magnetic
poles, north and south, although they are also produced by charges
(but moving charges).
- Like poles repel; unlike poles attract
- Electric field points in the direction of the force experienced
by a positive charge. Magnetic field points in the direction of the
force experienced by a north pole.
Differences between magnetic fields and electric fields:
- Positive and negative charges can exist separately. North and
south poles always come together. Single magnetic poles, known as
magnetic monopoles, have been proposed theoretically, but a
magnetic monopole has never been observed.
- Electric field lines have definite starting and ending points.
Magnetic field lines are continuous loops. Outside a magnet the
field is directed from the north pole to the south pole. Inside a
magnet the field runs from south to north.