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, Conductors Iron, metals
e- bound loosely to nucleus, free to move
Insulators Wood, rubber
e- bound tightly to nucleus
Semiconductors Silicon, germanium
Coulumb's Law F = kq1q2/r^2
K proportionality constant 9.0 x 10^-12 Nm^2/C^2
Charge of proton/electron (elementary charge) e = 1.6 x 10^-19 C
Coulomb's Law with permittivity of free space F = (1/4πε)*(Q1Q2/r^2)
Permittivity of free space ε = 1/(4π k)
ε = 8.9 x 10^-12 C^2/Nm^2
Net Coulomb force F(net) = F1 + F2 + F3...
Electric field E = F/Q
Electric field units N/C
Electric field of single point charge E = kQ/r^2