# MyOpenMath/Physics images

Shows differential for integrating Biot-Savart Law
File:Rail gun.jpg
Electromagnetic momentum archery analogy
The first four terms of the Fourier series of a square wave, ${\displaystyle \psi (x)={\frac {4}{\pi }}\sin(\pi x)}$ ${\displaystyle +{\frac {4}{3\pi }}\sin(3\pi x)}$ ${\displaystyle +{\frac {4}{5\pi }}\sin(5\pi x)}$ ${\displaystyle +{\frac {4}{7\pi }}\sin(7\pi x)+\ldots }$${\displaystyle =\sum _{{\text{odd }}n=1}^{\infty }{\frac {4}{n\pi }}\sin(n\pi x)}$.
Figure for calculating wave equation for transverse string waves
Five fair coins to illustrate the additive property of Shannon's information entropy
Shannon's entropy for unfair coin
Establishes that 3 items have 3!=6 permutations.
5 choose 3 versus permutation of ordered set of five objects.