Question

A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery and a current is created, the compass needle moves and changes its position. Which is the best explanation for the production of a force that causes the needle to move?
(1)The copper wire magnetizes the compass needle and exerts the force on the compass needle.
(2)The compass needle magnetizes the copper wire and exerts the force on the compass needle.
(3)The insulation on the wire becomes charged, which exerts the force on the compass needle.
(4)The current in the wire produces a magnetic field that exerts the force on the compass needle.

Answer 1

acts at a distance. fjghfrhgdfuighuidfgui

Answer 2

4

Every current through a wire produced a magnetic field. And since the magnetic field of Earth is weak, it will get attracted towards the wire.