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SI: m/s
SI: Newtons- (N)
v
Represented by
B_o the mean value of the magnetic field at the magnetic equator on the Earth's surface
R is the mean radius of the Earth (approximately 6370 km)
r is the radial distance from the center of the Earth (using the same units as used for R)
theta is the azimuth measured from the north magnetic pole.
SI: N
SI: Tesla- (T)
Represented by
qE
Typically represented by
B
Maxwell Equations
and in general terms
magnets
Ampere's Law
Faraday's Law
as conductors or fields by
solenoids
by
Electric Current
Magnetic Force
wire
interactions with moving charges
in terms of
basic source
leads to
magnetic field diagrams
Lorentz Force Law
Electric Current
involves
can be described using
can be defined by
generated by
F = qE + qv (B)
the total force acting on a charge
is the
B
F
Typically represented by
the total force acting on a charge
is the
F = qE + qv (B)
Earliest uses of magetism were in rudimentary compasses used for divination. Origins traced Chinese, Indian, Arabic, and Olmec cultures.
600 BC: A type of naturally occuring magnetic rock called lodestone or magnetite was observed attracting iron by Greek philosophers.
1269: Pierre de Maricourt discovers that every magnet has two poles (north and south).
1865-1892: James Clerk Maxwell, Oliver Heavside, J.J. Thomson, and Hendrik Lorentz publish and/or correct equations explaining how electrically charged particles and currents give rise to electric and magnetic fields, the magnetic force on a charged object in motion, and the electromagnetic force that includes the total force of electric and magnetic fields.
Describes laws of magnetic repulsion and attraction.
1600: Willian Gilbert's experiments determine that Earth itself is a magnet.
1819: Hans Christian Oersted notices that a nearby electric current deflected a compass needle, and witnesses a connection between magnetism and electricity.
1831: Michael Faraday discovers electromagnetic induction by discovering that changing magnetic field creates an encircled electric field.