- 33

- 0

**1. The problem statement, all variables and given/known data**

div(J)=0 in volume V, and J.n=0 on surface S enclosing V, where n is the normal vector to the surface.

Show that the integral over V of J dV is zero.

**2. Relevant equations**

**3. The attempt at a solution**

I can't get anywhere with it! The divergence theorem doesn't seem to help, as I just go round in circles. Any help at all will really be useful.

Thanks