Physics

Problem

Two identical long, straight wires carry currents of

15\,\text{A}

in the same direction. How far apart should the wires be placed so that the magnitude of the force per unit length on each wire is

3.0\times10^{-4}\,\text{N}\!/\!\text{m}

? a)

0.075\,\text{m}

0.15\,\text{m}

1.5\,\text{m}

0.015\,\text{m}