A long straight wire lies in the plane of the page

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

Problem

A long straight wire lies in the plane of the page, parallel to and

6.0\,\text{cm}

to the right of the right side of a square loop. The loop has side length

12\,\text{cm}

and carries a

3.0\,\text{A}

current in the counterclockwise direction (as viewed from above). Positive current in the straight wire is defined as flowing upward along the page. What magnitude and direction of current in the straight wire will make the net magnetic field at the center of the square equal to zero? (Assume the permeability of free space has its standard value.) (a)

17\,\text{A}

downward (b)

4.3\,\text{A}

upward (c)

17\,\text{A}

upward (d)

8.5\,\text{A}

upward

Related theory

Fields due to Currents
Biot-Savart law
Moving Charges and Magnetism

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