Suppose f(r) is a localized vector function and j(r, t) = j(r|) exp(it) is a time-harmonic current density where Prove that j(r, t) does not

Suppose f(r) is a localized vector function and j(r, t) = j(r|ω) exp(−iωt) is a time-harmonic current density where

Prove that j(r, t) does not radiate and find the physical meaning of f(r, t).

w iwpoj (rw) = V x [V x f(r)] - -f(r).