The magnetic field lines around a current-carrying circular loop form concentric circles, and their size increases with distance from the wire, creating a pattern that gradually enlarges.

Directly below, the magnetic field lines circulate counterclockwise, and directly above, they circulate clockwise around the power line.

The fingers wrap around the conductor in a circular manner, indicating the orientation of the magnetic field lines.

The thumb points from east to west in the direction of the current.

The direction of the magnetic field lines around a straight conductor depends on the direction of the current flowing through it.