Question

A Current of 5 A flows through each of two parallel long wires. The wires are 2.5 m
apart. Calculate the force acting per unit length of each wire. What will be the
nature of the force, if both currents are acting in the same direction?

Answer 1

☆ Solution

Given :  I1=I2=5 A                d=1 m

Force per unit length between them    F=2πdμoI1I2

∴  F=2π×14π×10−7×5×5=5×10−6 N/m

Since current flows in the same direction in the wires, so the wires attract each other.