Physics

Problem

Two long, straight, parallel wires carry equal currents of

10\,\text{A}

in the same direction. What should be the separation between the wires so that the magnitude of the attractive force per unit length equals

4.0\times10^{-5}\,\text{N\,m}^{-1}

? a)

0.25\,\text{m}

0.50\,\text{m}

1.0\,\text{m}

0.050\,\text{m}