Posted on August 22, 2011 by Mathew AbrahamCurrent electricity – Numerical A 10m length of aluminium wire has a diameter of 1.5mm. It carries a current of 12A. Find (i) the current density. (ii) the drift velocity (iii) the electric field in the wire. aluminium has approximately 10^29 free electrons per m^3 Share with FriendsTweetMoreShare on TumblrEmailPrintPocketNo related posts.