force of wire?

Question

A long straight wire is carrying a current of 2.4 A in a region where the magnetic field is perpendicular to the wire. If the magnetic field is 0.52 mT, what is the magnitude of the force on 3.0 m of the wire??

a) 1.2 * 10^-3 N
b) 3.7 * 10^-3 N
c) 7.2 * 10^-3 N
d) 3.7 N
E) 7.2 N

please help and explain thanks

Answer 1

B, 0.003744 N. The force per meter is simply IB, I=current, B=magnetic field. See the ref.