When two long parallel wires carry unequal currents, the magnitude of the magnetic force that one wire exerts on the other is F. If the current in both wires is now doubled, what is the magnitude of the new magnetic force on each wire?
A) 16F
B) 8F
C) 4F
D) 2F
E) F $\sqrt { 2 }$

Question

Quizplus · Accepted Answer

The magnetic force between two parallel wires is directly proportional to the product of the currents in the wires. If both currents are doubled, the force becomes four times the original force, hence 4F.

When Two Long Parallel Wires Carry Unequal Currents, the Magnitude 2\sqrt { 2 }2​

When Two Long Parallel Wires Carry Unequal Currents, the Magnitude $\sqrt { 2 }$