The Fundamental Forces of Nature Electromagnetism

Lighting Up Electromagnetism

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Electromagnetism studies theaffects of electric charges both at rest and in motion.  As one of the four fundamental forces of nature and the main binding force of the atom outside the nucleus, electromagnetic theory is important to understanding nature.

The property of subatomic particle that gives rise to electric fields is called charge. The charge of a particle can be negative, positive, or neutral. Charge is a fundamental property of matter. Magnetism is the force of attraction or repulsion resulting from the motion of electric charges.

While the force lines associated with electric charges tend to be strait, magnetic force lines tend to be circular. Electrodynamics is the branch of physics dealing with the electromagnetic forces between electric charges. In its most basic form electrodynamics deals with the affect of charges in relative motion. It is this mutual production of electric and magnetic fields that  forms the  bases of the unification of eclectic and magnetic fields. Every thing else in electromagnetism extends from this starting principles.



Moving Things by Force

That which causes a free body to undergo acceleration is called foece.

There are four fundamental forces in Nature. They are gravity which is the mutual attraction of all matter in the universe it is what holds you to the Earth, electromagnetism which is the mutual attraction and repulsion of charged partials, the weak nuclear force is that which regulates types of nuclear decay such as Bata decay by overcoming the strong nuclear force and the strong nuclear force is the binding force that holds the atomic nucleus together against the tendency of positively charged protons.

Force causes mater to accelerate which is the main function of force by definition. It can be used to overcome other forces such as friction gravity. Force also holds things together since the electromagnetic force holds an object together including your body and the strong nuclear force holds atomic nuclei together. It can break things apart such as bombs or the force resulting from ramming two things together which can cause them to shatter and the peaces to fly apart.
Regardless of its source force causes acceleration. Force can also stop acceleration by resisting another force. Force holes thing together so force does indeed bind us together

The Earth’s Magnetosphere

The Earth has a strong electric current at its core, which produces an intense magnetic field. This magnetic field holds a magnetosphere in place which contains the Van Allen belts. The magnetosphere consists of regions (belts) surrounding the Earth where charged particles are trapped by the magnetic field. The Earth's magnetic field and the magnetosphere it produces protect us from dangerous radiation from solar flares.
Charged naturally become trapped in a magnetic field; however the density of the Earth's magnetosphere is the highest among the planets of the solar system. In fact the only other rocky planet with a magnetic field is Mercury with field strength 100 times smaller than the Earth's.

The strength of Earth's magnetic field is decreasing and since the magnetosphere is generated by the magnetic field, it is likely decreasing also, although this has not been directly confirmed. If Earth's magnetic field were to decay completely, the magnetosphere would also disappear since there would be nothing to confine the charged particles. Now the planetary dynamo model says that the field will reverse and rebuild but it has to go through a period of collapse before it can reverse.