A wire carries a current of 10 A in the in a uniform magnetic field of 0.40 T. Find the magnitude of the force per unit length and the direction of the force on the wire if the magnetic field is
(a) In the + x-direction,
(b) In the + y-direction,
(c) In the +z-direction,
(d) In the -y-direction,
(e) In the -z-direction, and
(f) At an angle of 45° above the + x-axis and in the x-y plane.