Two long straight wires A and B are kept parallel to each other, apart, in vacuum. They carry…

Two long straight wires A and B are kept parallel to each other, $5\text{ cm}$ apart, in vacuum. They carry currents of $5\text{ A}$ and $10\text{ A}$ respectively in the same direction as shown in Figure 1 below. Calculate the force per unit length acting on the wire B due to the current flowing in the wire A.