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Solution: As shown in the figure, four long parallel wires lie on the ...

Question

As shown in the figure, four long parallel wires lie on the corners of a square, with a 5th at the center. All wires carry identical currents, with directions shown in the figure (a cross inside a circle means the current is into the page while a dot inside a circle means the current is out of the page). What is the direction of the net force on the central wire (angles are measured from the +x axis)?

(1) 0°

(2) 45°

(3) 90°

(4) 135°

(5) 270°