# Given an electric field, how to find its field lines?

1. Feb 7, 2012

### AlonsoMcLaren

Given the mathematical expression of an electric field, how to find its field lines?

2. Feb 7, 2012

### clem

As a simple case, take $$E_x=f(x,y),\quad E_y=g(x,y)$$.
Then solve the differential equation $$dy/dx=g/f$$ for y(x).