Electromagnetism ... the second step on the road to unification
first: Newton unified planetary & terrestrial gravity
like the force the floor exerts
on your feet,
most everyday
forces due to electromagnetic
forces resist
displacement of atoms
from
equilibrium position
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Maxwell: second unification of
forces - electricity
and magnetism
electrical charge (positive/negative) and
magnetism
(north/south) are different aspects
of the same
force -- electomagnetism
Oppositely charged objects, such as a proton
and electron,
attract one another,
particles
with the same charge repel each other