Equation for magnetic moment, E-field and B-field

[pangsiukwong]

Hi!

When a charge/current moves in a closed loop, a magnetic moment is generated.
Is there any formula for connecting the magnetic moment to E-field and B-field?

Patrick

 

[Meir Achuz]

A magnetic moment m (a vector) produces a magnetic field given by
B=[3(m.r)r/r^5-m/r^3] plus a delta function if r-->0.
The r in the numerators are vectors and . means the dot product.
There is no E field produced.