Two long parallel wires are apart and carry currents of and in the same direction

MATHEMATICS · Single correct · ISC · Physics · Magnetic Effects of Current and Magnetism · Ampere's circuital law

Problem

Two long parallel wires are

4.0\,\text{cm}

apart and carry currents of

6\,\text{A}

and

9\,\text{A}

in the same direction. At what distance from the

6\,\text{A}

wire (along the line joining the wires) will the net magnetic field be zero? (a)

2.4\,\text{cm}

(b)

1.0\,\text{cm}

(c)

1.6\,\text{cm}

(d)

1.8\,\text{cm}