Consider a tiny current loop driven by a solenoidal alternating current. If the surface integral of its time averaged Poynting vector is constant, then the magnitude of the time averaged magnetic field intensity, at any arbitrary position \(\vec{r} \) is proportional to?
1
\(\frac{1}{r^3} \)
2
\(\frac{1}{r^2} \)
3
\(\frac{1}{r } \)
4
\(r \)