A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery, the compass needle changes position.Which of the following is the bestexplanation for the movement of the needle?
A)The copper wire magnetizes the needle to create a force.
B)The needle magnetizes the copper wire to create a force.
C)The current in the wire produces a magnetic field and exerts a force on the needle.
D)The insulation on the wire becomes energized and exerts a force on the needle.

Question

Quizplus · Accepted Answer

The current flowing through the copper wire generates a magnetic field around the wire. This magnetic field interacts with the magnetic field of the compass needle, causing the needle to move. This is a direct application of Ampère's law, which relates magnetic fields to the currents that produce them.

A Magnetic Compass Is Placed near an Insulated Copper Wire