# Ampere's Law

1. Nov 18, 2013

### rinspd

What is the wavelength of a wave that has a frequency of 60MHz?

Last edited: Nov 18, 2013
2. Nov 18, 2013

### iRaid

Well amperes law is: $\oint \vec{B}\cdot d\vec{s}=\mu_{o}I$. If you know its a wire, what does that tell you about the ds? And the dot product between the vectors B and ds is what? With that you can plug in 0.5B to find R...