Question

Two parallel wires A and B 10cm apart and carry currents of 10 A and 6 A respectively. Find the force on a 2.0 m length of wire B, if the currents are in the same direction

Answer 1

$F=\frac{\mu_0I_1I_2l}{2\pi d},$

$F=\frac{2\cdot 10\cdot 6\cdot 2}{0.1}=2.4~kN.$