Force on Currents: a Wire Carries a 4

Force on currents: A wire carries a 4.0-A current along the +x-axis through a magnetic field = (5.0 + 7.0 ) T. If the wire experiences a force of 30 N as a result, how long is the wire?

A) 1.1 m
B) 0.87 m
C) 1.5 m
D) 0.63 m