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Electrostatic Force and Electric Charge

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 electric flux through any closed surface is proportional to the net charge enclosed. r r E dA Q enclosed S ∫ ⋅ = e0 For the discrete case the total charge enclosed is the sum over all the enclosed charges: Q enclosed qi i N = = ∑ 1 For the continuous case the …

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