Recent content by zql

And how about "hidden momentum"? I didn't know about this.

I think I got it, thanks.

can you give me more details？thanks.

There is a situation, we have an electric field and a magnetic field, both are static. And we know the density of energy is u=E·D/2+B·H/2, so dU/dt=0, but Poynting vector S=ExH is not zero, which means energy is flowing. This confused me. Static field also has energy flux?