# Electromagnetic waves & influence

1. Nov 5, 2008

### Denton

Why is it that electromagnetic waves, made up of constantly changing electric and magnetic fields are neither affected by electric or magnetic fields?...

2. Nov 5, 2008

### Staff: Mentor

It's because Maxwell's equations are linear in the fields $\vec E$ and $\vec B$. They contain no terms involving products of the fields or their derivatives.