You could use two parallel wires to move objects 1 and 2 apart if each wire is embedded in its own object and if
A) the currents in the wires are in opposite directions.
B) the currents in the wires are in the same direction.
C) one wire carries a current and the other wire has zero current.

Question

You could use two parallel wires to move objects 1 and 2 apart if each wire is embedded in its own object and if 
A) the currents in the wires are in opposite directions. 
B) the currents in the wires are in the same direction. 
C) one wire carries a current and the other wire has zero current.

Quizplus · Accepted Answer

When the currents in the wires are in opposite directions, they create a magnetic field that pushes the objects apart. This is known as the Lorentz force. If the currents were in the same direction, they would create a magnetic attraction between the wires, which would not move the objects apart. If one wire had zero current, there would be no magnetic field to create any force on the objects.

You Could Use Two Parallel Wires to Move Objects 1