zhang review

# zhang review - 2/17/2010 Coulombs law | q | q | | F | ke 1...

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2/17/2010 1 Coulomb’s law Multiple charges: Superposition principle ( vector addition ) 2 2 1 | || | | | r q q k F e 1 q 2 q 3 q 13 F 23 F 3 F F F 2 3 1 | | | | r q q k F e 2 3 2 | | | | r q q k F e A charge generates an electric field around it: E field due to multiple charges: Superposition principle ( vector addition) An electric field exert an electric force on other charges - positive charge experiences a force along the direction of the field - negative charge: force is opposite to the field direction E q F 2 | | | | r q k E e

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2/17/2010 2 If a negative charge is placed at point A, what is the direction of the electric force on it? (1) Up (2) Down (3) Left (4) Right A + _ +q -q r r q Potential energy difference and potential difference Energy conservation For uniform electric field: Potential drops along the direction of the field Potential due to point charge: Multiple charge: (algebraic sum) Potential energy of a two-charge system: 0
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## zhang review - 2/17/2010 Coulombs law | q | q | | F | ke 1...

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