Applied Physics 2: Electric field due to an infinite line of charge (no voiceover)

Example of using line charge density to compute the E-field due to an infinite line of charge. The test point is on an axis bisecting the line.
Assumed knowledge: Coulomb's law; Calculus 3 / multivar; trigonometric derivatives and differentials. Reference is made to Gauss's law, at the end.
Recommended playback speed: 2x