IMathAS-libretexts

Two long, parallel wires are separated by a distance $\displaystyle {d}$ , as shown above. One wire carries a steady current $\displaystyle {I}$ into the plane of the page while the other wire carrries a steady current $\displaystyle {I}$ out of the page. At what points in the plane of the page and outside the wires, besides points at infinity, is the magnetic field due to the currents zero?

At no points
At all points on the circle of radius 2 $\displaystyle {d}$ centered on point $\displaystyle {P}$
At all points on the line connecting the two wires
At all points on the line $\displaystyle {S}{S}$ '
Only at point $\displaystyle {P}$

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