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

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

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)