PHYS 1070 Lecture Notes - Lecture 26: Relative Permittivity

• School: University of Guelph
• Department: Physics
• Course: PHYS 1070
• Professor: Jason Thomas

Document Summary

F. 1 < + (q1) - - - - - r - - - - - + (q2) > f. 2 unlike charges attract. + (q1) > f. 1 f. 2 < - (q2) |f. 1 2| = k |q1q2| / k r^2. The medium reduces, or screens the electric force, as k increases, | f | decreases. Consider an electron and a proton separated by 1. 0 cm in vacuum (k=1) (e-) - - 1cm - - + (p) There is also an electric force between them: = (9. 0x10^9 nm^2/c^2) x |(-1. 6x10^-19 c)(+1. 6x10^-19 c) / (1. 0)(0. 01m)^2. |f. e| / |f. g| = 2. 3x10^-24 n / 1. 0x10^-63 n. We can separate coulomb"s law into two parts: |e. 1| = k |q1| / k r^2 > f. 2 1 = q2 e. 1. The electric eld has units that are n/c, and it also is a vector. At any point in space the electric eld, e is tangent to the eld lines.