What is the right hand rule for current in a wire and how is it applied to determine the direction of the magnetic field produced by the current flow?

The right-hand rule for current in a wire states that if you point your right thumb in the direction of the current flow, then the direction your fingers curl around the wire represents the direction of the magnetic field produced by the current. This rule helps determine the relationship between the direction of current flow and the resulting magnetic field around the wire.