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Unformatted text preview: 1 Electrostatics 2 2 1 r q q k F = 1. Charge b force: Like sign charges repel, unlike sign charges attract. Coulombs Law: direction and magnitude of force between two point charges. 2. Force b electric field: Introduced to explain interaction over a distance. Field lines: start from positive charge, end at negative charge. More often used as: 3. Force b charge: Force moves charge, does work on charge. Electric potential. 4. Electric field b charge: Electric flux: Electric field originated from charge: Gauss Law. test q F E r r E q F r r = - = B A r d F U r r B) (A S d E E r r = = surface enclosed E q S d E r r 2 Direct Current dt dq I 1. Moving charge b current: Electric field inside a conductor keeps the charges moving. Current direction is defined as the electric field direction. 2. Charge b electric potential: Accumulated charge generates potential: capacitance. Parallel plate capacitor. Energy stored in a capacitor. 3. Current b resistance: Ohms law defines resistance. Resistance as a function of the wire. Resistance as a linear function of temperature....
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