FACTS : - Electric charge is the physical property of matter that causes it to experience a force when close to other electrically charged matter. - There are two types of electric charges – positive and negative. - Positively charged substances are repelled from other positively charged substances, but attracted to negatively charged substances; negatively charged substances are repelled from negative and attracted to positive. - An object will be negatively charged if it has an excess of electrons, and will otherwise be positively charged or uncharged. - The SI derived unit of electric charge is the coulomb (C), although in electrical engineering it is also common to use the ampere-hour (Ah), and in chemistry it is common to use the elementary charge (e) as a unit. - The symbol Q is often used to denote a charge. The study of how charged substances interact is classical electrodynamics, which is accurate insofar as quantum effects can be ignored. - The electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. - Electrically charged matter is influenced by, and produces, electromagnetic fields. - The interaction between a moving charge and an electromagnetic field is the source of the electromagnetic force, which is one of the four fundamental forces (See also: magnetic field). - Twentieth-century experiments demonstrated that electric charge is quantized; that is, it comes in integer multiples of individual small units called the elementary charge, e, approximately equal to 1.602×10-19 coulombs (except for particles called quarks, which have charges that are integer multiples of e/3). - The proton has a charge of e, and the electron has a charge of -e. - The study of charged particles, and how their interactions are mediated by photons, is quantum electrodynamics.
Posted on: Thu, 01 Jan 2015 03:34:45 +0000
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