Three Coplanar Parallel Straight Wires Carry Equal Currents I to the Right

question 3

Multiple Choice

Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom 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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Definitions:

Valence Electrons

Electrons in the outer shell of an atom that are available for bonding with other atoms.

Nucleus

The center or middle.

Atom Contains

Atoms consist of a nucleus made of protons and neutrons, surrounded by electrons in orbital shells.

Atomic Number

The atomic number is equal to the number of protons (positively charged particles) in the nucleus of an atom.