lec01 - • Inside an insulator , electrons are bound to...

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Electric Charges Electric force is a force between charges . There are two kinds of charges – positive and negative. Like charges repel and unlike charges attract. In nature, charges exist in integer multiples of an indivisible amount: 1.6x10 -19 Coulombs (defined as “e” ) . The smallest positive and the smallest negative charges are carried by the protons and the electrons, which are the basic constituents of all matter. charge of electron = -e charge of proton = + e Charges can neither be created nor destroyed. Charges (electrons) can be transferred. An object can become “charged” if electrons are transferred to or from it (charging by contact). Inside a conductor , fraction of the electrons can move about freely. A conductor can be charged by contact or by induction.
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Unformatted text preview: • Inside an insulator , electrons are bound to atomic sites and are not mobile. – Charging an insulator by induction does not work. – Placed near a charged object, a slight surface charge can be induced due to the separation of positive and negative charges in molecules. Electric Forces • Electric force operates between charges – Like charges ( + + or − − ) repel each other – Unlike charges ( + − ) attract each other • Magnitude of electric force is given by Coulomb’s Law • Electric force is much, much stronger than the force of gravity. It is the force that is responsible for holding the atoms together to form bulk matter. ) 10 9 where ( 2 2 9 2 2 1 21 12 − × = = = C Nm k r q q k F F q 1 q 2 F 21 F 12 r r q 1 q 2 F 21 F 12 r q 1 q 2 F 21 F 12...
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This note was uploaded on 12/06/2011 for the course PHYSICS 111&112 taught by Professor Unknown during the Spring '11 term at Ohio State.

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lec01 - • Inside an insulator , electrons are bound to...

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