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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Electric_charge
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1992-09-02
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Property of some bodies that causes them to
exert forces on each other. Two bodies both
with positive or both with negative charges
repel each other, whereas bodies with
opposite or `unlike' charges attract each
other, since each is in the electric field of
the other. In atoms, electrons possess a
negative charge, and protons an equal
positive charge. The unit of electric charge
is the coulomb (symbol C). Atoms have no
charge but can sometimes gain electrons to
become negative ions or lose them to become
positive ions. So-called static electricity,
seen in such phenomena as the charging of
nylon shirts when they are pulled on or off,
or in brushing hair, is in fact the gain or
loss of electrons from the surface atoms. A
flow of charge (such as electrons through a
copper wire) constitutes an electric current;
the flow of current is measured in amperes
(symbol A). Electric charge can be generated
by friction induction or chemical change and
shows itself as an accumulation of electrons
(negative charge) or loss of electrons
(positive charge) on an atom or body. Atoms
have no charge but can sometimes gain
electrons to become negative ions or lose
them to become positive ions. So-called
static electricity, seen in such phenomena as
the charging of nylon shirts when they are
pulled on or off, or in brushing hair, is in
fact the gain or loss of electrons from the
surface atoms. A flow of charge (such as
electrons through a copper wire) constitutes
an electric current; the flow of current is
measured in amperes (symbol A).