![]() ![]() Lund rħ Electric field strength (at a point P) is the force per unit positive point/test charge placed at that point. Be very clear that r is the distance between the centers of the charges. Lund Charges immersed in a different medium □= 1 4□□ □ 1 □ 2 □ 2 □ is permittivity of the mediumĬoulomb’s law works not only for point charges, which have no radii, but for any spherical distribution of charge at any radius. Material Permittivity /10-12C2 N-1m-2 vacuum(0 ) 8.85 air ~ 8.85 paper 34 rubber 62 water 779 graphite 106 diamond 71 © 2014 By Timothy K. ▪ charge is measured in Coulombs ▪ Coulomb is defined as the charge transported by a current of one ampere in one second ▪ fundamental amount of charge is known as the electronic (or elementary) charge ▪ e =1.6 x C ratom ≈ x rnucleus mnucleon ≈ 2000 x melectronĥ Coulomb’s law: Electric force between TWO POINT charges q1 and q2 separated by distance r is: Charges that are in a vacuum k = 8.99109 N m2 C−2 □=□ □ 1 □ 2 □ 2 k is Coulomb’s constant. ◊ Remove electrons and make the object positively charged. ▪ charge is a scalar quantity ▪ charge is quantized ▪ charge is conserved in a closed system ▪ charging neutral object ◊ Add electrons and make the object negatively charged. ![]() ![]() Presentation on theme: "IB physics Data booklet review CORE."- Presentation transcript:Ĥ 5.1 Charge and field ▪ charge comes in two forms + and – ![]()
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