Two Parallel Wires, 4 Cm Apart, Carry Currents of 2

Multiple Choice

Two parallel wires, 4 cm apart, carry currents of 2 A and 4 A respectively, in opposite directions. The force per unit length in N/m of one wire on the other is:

A) 1 *10^-3, repulsive
B) 1 *10^-3, attractive
C) 4 * 10^-5, repulsive
D) 4 *10^-5, attractive
E) none of these