Two parallel long conductors carry currents of and respectively in the same direction

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

Two parallel long conductors carry currents of

12\,\text{A}

and

18\,\text{A}

respectively in the same direction. The distance between the conductors is

10\,\text{cm}

. At what distance from the

12\,\text{A}

conductor, along the line joining the two conductors, will the resultant magnetic field be zero? (a)

4\,\text{cm}

between the two conductors (b)

6\,\text{cm}

between the two conductors (c)

20\,\text{cm}

on the side of the

12\,\text{A}

conductor away from the

18\,\text{A}

conductor (d)

8\,\text{cm}

between the two conductors