L10_a - ELECTRIC FORCE (Chapter 19) Electric forces are...

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ELECTRIC FORCE (Chapter 19) Electric forces are important All interatomic and intermolecular forces are electric o i.e. forces that determine properties of materials Two kinds of charge: positive (+) and negative (-) opposite charges attract, like charges repel Net charge in an isolated system is conserved (i.e. constant) Always an integral multiple of electron charge ( ) C e 19 10 60 . 1 × = Can classify materials by electrical properties Conductor: electrons flow freely (i.e. metals) Semiconductor: electrons flow but can be controlled (i.e. silicon, used in electronics) Insulator: electrons bound to atoms or molecules in material
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Can separate positive and negative charges in materials: Can charge a conductor by INDUCTION: Connection to ground allows charged rod to push like charge away o Creates charge imbalance in conductor Remove ground while charged rod remains in place o Conductor remains charged Charged rod removed o Conductor retains a NET CHARGE
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L10_a - ELECTRIC FORCE (Chapter 19) Electric forces are...

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