In the given scenario, where does the thumb point when using the right-hand rule for a current flowing from east to west in a horizontal power line?

In the right-hand rule for a current flowing from east to west in a horizontal power line, if you point your index finger eastward (representing the direction of the current) and your middle finger upward (representing the direction of the magnetic field), your thumb will point northward. This indicates that the force experienced by a positive charge due to the current in the magnetic field is directed toward the north. The right-hand rule helps determine the direction of the force on a charged particle in a magnetic field created by the current flow in the power line.