Two long parallel wires are 0.20 m apart and carry currents 5 A and 10 A in the same direction. Calculate the attractive force per metre in μN/m.

Question

G1 Physics · Accepted Answer

F/L=μ₀I₁I₂/(2πd)=2×10⁻⁷×50/0.20=5×10⁻⁵ N/m=50 μN/m.