A straight wire of length 30 cm and mass 60 milligrawm lies in a direction `30^0` east of north. The earth's magnetic field at this site is horizontal and has a magnitude of 0.8 G. What current must be passed through the wire so that it may float in air ? `(g=10m/s^2)`
Options:
(a) 10 Amp
(b) 20 Amp
(c) 40 Amp
(d) 50 Amp