E at point from point charge
k|q|/r^2 * r_hat
F from E-field onto a charge
E*q
E (integrating from container)
= k*integral(dq/r^2)
λ meaning
linear charge density
σ meaning
surface charge density
σ equation
q/A
ρ meaning
Volume Charge Density
r vector meaning
position
E for line(L) with λ, D away
integral[D, D+L] (λ*dr/r^2)