I am having a little trouble with this. To attack this problem (I reckon anyway) is to recognise that the current density vector(adsbygoogle = window.adsbygoogle || []).push({}); J(x) can be written it terms of the number density and the velocity. But I'm not sure how to incorporate the Taylor expansion with the cross product. If somebody could give me a few hints just to get me started again that would be great!

Cheers

GM

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Momentum of electromagnetic fields

**Physics Forums | Science Articles, Homework Help, Discussion**