Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic
currents associated with electrons in atomic orbits. The magnetic field B is
defined in terms of force on moving charge in the Lorentz force law. The interaction of magnetic field with charge leads to many practical application. Magnetic field sources are essentially dipolar in
nature, having a north and south magnetic pole. The SI unit for magnetic field
is the Tesla, which can be seen from the magnetic part of the Lorentz force law
Fmagnetic = qvB to be composed of (Newton x second)/(Coulomb x
meter). A smaller magnetic field unit is the Gauss (1 Tesla = 10,000 Gauss).
Magnetic fields
are different from electric fields. Although both types of fields are
interconnected, they do different things. The idea of magnetic field lines and
magnetic fields was first examined by Michael Faraday and
later by James Clerk Maxwell. Both of these English scientists
made great discoveries in the field of electromagnetism.
Magnetic fields are areas where an object exhibits a magnetic influence. The fields affect neighboring objects along things called magnetic field lines. A magnetic object can attract or push away another magnetic object. You also need to remember that magnetic forces are not related to gravity. The amount of gravity is based on an object's mass, while magnetic strength is based on the material that the object is made of.
If you place an object in a magnetic field, it will be affected, and the effect will happen along field lines. Many classroom experiments watch small pieces of iron line up around magnets along the field lines. Magnetic poles are the points where the magnetic field lines begin and end. Field lines converge or come together at the poles. You have probably heard of the poles of the Earth. Those poles are places where our planets field lines come together. We call those poles north and south because that's where they're located on Earth. All magnetic objects have field lines and poles. It can be as small as an atom or as large as a star.
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