Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direct

Question

Two long and parallel straight wires A and B carrying currents of 8.0 A and 5.0 A in the same direction are separated by a distance of 4.0 cm. Estimate the force on a 10 cm section of wire A.

Professor PC Thomas Classes · Answer

$F = \frac{\mu_0 I_A I_B L}{2\pi d} = \frac{4\pi 	imes 10^{-7} 	imes 8.0 	imes 5.0 	imes 0.10}{2\pi 	imes 0.04} = 2.0 	imes 10^{-5}	ext{ N}$. Currents in the same direction attract each other.