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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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