Chapter 28.2, Problem 28.2TYU

An infinitesimal current element located at the origin ( x = y = z = 0) carries current I in the positive y-direction. Rank the following locations in order of the strength of the magnetic field that the current element produces at that location, from largest to smallest value. (i) x = L, y = 0, z = 0; (ii) x = 0, y = L, z = 0; (iii) x = 0, y = 0, z = L; (iv) x = $L/\sqrt{2}$, y = $L/\sqrt{2}$, z = 0.