Two long parallel wires are apart and carry currents of and in opposite directions

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

Two long parallel wires are

6.0\,\text{cm}

apart and carry currents of

10\,\text{A}

and

40\,\text{A}

in opposite directions. Along the line joining the wires, at what distance from the

10\,\text{A}

wire is the resultant magnetic field zero? (a)

4.8\,\text{cm}

(b)

2.0\,\text{cm}

(c)

1.2\,\text{cm}

(d)

2.4\,\text{cm}