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

Question

Quizplus · Accepted Answer

The magnitude of the force between the wires is directly proportional to the product of the currents in the wires. Doubling the current in each wire will result in the product of the currents being quadrupled, and therefore the magnitude of the force will also quadruple.

Two Long, Parallel Wires Carry Currents of Different Magnitudes