(7-5 points) magnetic field B is produced by a long straight wire carrying current of 6.2 milliamperes. The cross section of the wire is shown in the figure below, with the current coming out of the plane of the page. Consider a square with each side having a length of 1 meter in the plane of the page. If the wire is at the center of the square, what is the value of the line integral ∮ B·dl taken around the perimeter of the square in the counterclockwise direction?
2a
μ₀ = 4Ï€ × 10â»â· T·m/A