Question

Two 10 cm long, straight wires, each carrying a current of 5 A are kept parallel to each other. If each wire experienced a force of 10-5 N, then separation between the wires is _____ cm.

Answer 1

It should be mentioned, 10 cm wire is part of long wire.
Force experienced by unit length of wire

Fig. Force Experienced

$= \frac{μ_0I_1I_2}{2πd} × 10 ×10^{-2}$
$10^{−5} = \frac{2×10−7×5×5}{d}×10×10−2$
$d = 50 × 10^{–3} m$
$d = 50 × 10^{–1} cm$
d = 5 cm