Transcription of Electrostatic Force and Electric ... - Department of Physics
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Electrostatic Force and Electric ... - Department of Physics
R. D. FieldPHY 2049 Chapter Force and ElectricElectrostatic Force and ElectricChargeChargeElectrostatic Force ( charges at rest): Electrostatic Force can be attractive Electrostatic Force can be repulsive Electrostatic Force acts through emptyspace Electrostatic Force much stronger thangravity Electrostatic forces are inverse square law forces (proportional to1/r2) Electrostatic Force is proportional to the product of the amount of chargeon each interacting objectMagnitude of the Electrostatic Force is given by Coulomb'sLaw:F = K q1q2/r2 (Coulomb's Law)where K depends on the system of unitsK = Nm2/C2 (in MKS system)K = 1/(4 0) where 0 = C2/(Nm2) Electric Charge:electron charge = -ee = Cproton charge = eC = CoulombElectric charge is a conserved quantity (net Electric charge is nevercreated or destroyed!)
The charge Q produces an electric field which in turn produces a force on the charge q . The force on q is expressed ... F = K qQ/r 2 = q (KQ/r 2) = q E The electric field at the point q due to Q is simply the force per unit positive charge at the point q : E = F/ q E = KQ/r 2 The units of E are Newtons per Coulomb ( units = N/C ).
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