“Electromagnetism is the physics of the electromagnetic field,
that encompasses all of space, which exerts a force on particles
that possess the property of electric charge, and is in turn
affected by the presence and motion of those particles”
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THE HISTORY
Well, the history seems pretty “diverse”…
1802:
Italian philosopher Romagnosi (in 1802)
noticed that connecting a wire across a Voltaic pile
deflected a nearby compass needle (caused by
electromagnetism). He became one of the first to
discover and publish this idea of electromagnetism.
1820: Danish physicist Ørsted performed a similar
experiment. Ørsted’s work influenced French physicist
Ampère to produce a theory of electromagnetism that set
the subject on a mathematical foundation.
19th century: Various physicists developed the
classical electromagnetism theory. The idea was
ultimately unified and completed by James Clerk Maxwell.
Maxwell’s equations Classical electromagnetism is based
upon a set of equations known as Maxwell’s equations.
1905: The theoretical implications of
electromagnetism led to the development of special
relativity by Albert Einstein in 1905. |
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Looks
familiar? Well, all of these emit harmful EM waves! |
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 EM
and economy
Apart from its necessity in the physical and life sciences and
engineering (as a power), it intertwines with various other aspects of
our lives.
Like all other forces, it also has energy behind it. Thus, it impacts
all sectors of all the economies in the world.
Its conversion into mechanical forces has led to electrical machines
that power our industries, which are vital for any economy.
It also affects us economically on a daily basis through our food,
weather, consumer prices, and transportation.
It even affects local and global policies. For example, policies on
energy supply and conservation, and nuclear weapons depend, directly or
indirectly, on electromagnetism.
It is integrated in every part of our society as well. Radios,
televisions and computers have brought a revolution in information
technology and spread of knowledge. Mobile phones, appliances like alarm
clocks and microwaves have become a part of our everyday life.
A dark side…
It is strong enough to cause damage to the body’s natural defence
system. Blood cells slow down the work rate of carrying blood and oxygen
round the body. Even a few minutes’ exposure to EMFs can lead to
depression, headaches, mood swings, anxiety, lack of concentration,
irritableness, memory loss, depleted or low energy, damage immune system
and make you prone to diseases such as cancer and Alzheimer's.
Electromagnetism is related and inter-related with all aspects of our
lives, but the same force can be disastrous to human health and
environment.
Now, the question remains can we really choose not to use this force
when we are so dependent on it?
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