Physics

Problem

Three long, straight, parallel wires lie in the same plane. Wire A and wire C are

10\,\text{cm}

apart; wire B is midway between them. Wires A and B each carry a current of

20\,\text{A}

into the page, while wire C carries a current of

20\,\text{A}

out of the page. What is the magnitude and direction of the net force per unit length on wire B? a)

3.2\times10^{-3}\,\text{N/m}

toward wire A b)

3.2\times10^{-3}\,\text{N/m}

toward wire C c)

1.6\times10^{-3}\,\text{N/m}

toward wire A d)

0\,\text{N/m}

(no net force)