Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the force between these two wires?
A) It is doubled.
B) It stays the same.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by a factor of 2.

Question

Quizplus · Accepted Answer

The force between two parallel wires is proportional to the product of the currents in the wires. If one current is doubled and the other is halved, the product of the currents remains the same, so the force remains unchanged.

Two Long, Parallel Wires Carry Currents of Different Magnitudes