- #1
dRic2
Gold Member
- 883
- 225
Homework Statement
For a configuration of charges and currents confined within a volume ##V##, show that
$$\int_V \mathbf J d \tau = \frac {d \mathbf p}{dt}$$
where ##\mathbf p## is the total dipole moment.
Homework Equations
...
The Attempt at a Solution
I have one question: since the configuration of charges and currents is confined within a volume can I assume
$$∇ \cdot \mathbf J =0 $$
?
I mean, if there is no "in" nor "out", ##\frac {\partial \rho}{\partial t}## should be zero, right ?