A Copper Wire at the Earth's Equator Carries a 2340

A copper wire at the Earth's equator carries a 2340 A current.Assuming that the magnetic field of the earth of 0.5 G at the equator is parallel to the surface of the Earth and that the current flows to the east,what is the largest radius of the wire that can be levitated by the magnetic field?

A) 0.50 mm
B) 0.44 mm
C) 0.36 mm
D) 0.65 mm
E) 0.73 mm