Three Coplanar Parallel Straight Wires Carry Equal Currents I as Shown

question 14

Multiple Choice

Three coplanar parallel straight wires carry equal currents I as shown below. The current in the outer wires is directed to the right, and that in the middle wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire

• A) is up out of the plane of the wires.
• B) is down into the plane of the wires.
• C) is in the plane of the wires, directed upwards.
• D) is in the plane of the wires, directed downwards
• E) cannot be defined, because there is no magnetic force on the middle wire.

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