Question

4 multiple choice 2 points which diagram best illustrates the magnetic field that exists around a current - carrying wire?

Explanation:

The magnetic field around a current - carrying wire forms concentric circles. This is in accordance with Ampère's law and the right - hand rule. The first diagram shows straight lines perpendicular to the wire, which is incorrect. The second diagram shows elliptical - like shapes (not concentric circles) with arrows in a non - circular pattern. The third diagram shows parallel lines along the wire, which is wrong as the magnetic field is not parallel to the wire. The fourth diagram shows concentric circles around the wire, which is the correct representation of the magnetic field around a current - carrying wire.

Answer:

The fourth diagram.