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chp25_1 - Magnitude of the Electrostatic Force is given by...

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PHY2061 R. D. Field Department of Physics chp25_1.doc University of Florida Electrostatic Force and Electric Charge Electrostatic Force ( charges at rest ): Electrostatic force can be attractive Electrostatic force can be repulsive Electrostatic force acts through empty space Electrostatic force much stronger than gravity Electrostatic forces are inverse square law forces ( proportional to 1/r 2 ) Electrostatic force is proportional to the product of the amount of charge on each interacting object
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Unformatted text preview: Magnitude of the Electrostatic Force is given by Coulomb’s Law: F = K q 1 q 2 /r 2 (Coulomb’s Law) where K depends on the system of units K = 8.99x10 9 Nm 2 /C 2 (in MKS system) K = 1 / ( 4 πε πε ) where ε = 8.85x10-12 C 2 /(Nm 2 ) Electric Charge: electron charge = -e e = 1.6x10-19 C proton charge = e C = Coulomb Electric charge is a conserved quantity ( net electric charge is never created or destroyed ! ). q 1 q 2 r...
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