Three long parallel wires form the vertices of an equilateral triangle of side

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

Problem

4\,\text{cm}

. Currents of

10\,\text{A}

5\,\text{A}

and

7\,\text{A}

flow along

+z

+z

and

-z

directions respectively through the three wires. A circular Amperian loop of radius

6\,\text{cm}

is centred at the triangle’s centroid and lies in the plane of the triangle. What is the net current enclosed by this loop? (a)

22\,\text{A}

(b)

15\,\text{A}

(c)

8\,\text{A}

(d)

2\,\text{A}