Question

A 20-cm long conducting wire of 5-g carrying 5-A current is placed in a uniform magnetic field. The strength and direction of the magnetic field needed to levitate the wire are:

Answer 1

http://ezto.mhhm.mcgraw-hill.com/13252698191261007601.tp4?REQUEST=SHOWmedia&media=1image012.png

(a) 25 mT out of the page.
(b) 49.05 mT out of the page.
(c) 25 mT into the page.
(d) 49.05 mT into the page.
(e) 15 mT into the page.