Two parallel conductors are carrying currents in the same direction.The currents are non-zero and not necessarily equal.The magnitude of the magnetic field midway between them is 40 mT.If one of the currents then has its direction reversed,what is the resulting magnitude of the magnetic field midway between them?

Question

Quizplus · Accepted Answer

When the currents are in the same direction, their magnetic fields at the midpoint add up. When one current is reversed, the fields subtract, resulting in a greater net magnetic field than when they were in the same direction.

Two Parallel Conductors Are Carrying Currents in the Same Direction