A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

A current through a horizontal powerline flows in east to west direction. What is the direction of magnetic field at a point directly below it and a point directly above it?

A current flows through a horizontal power line from east to west. What is the direction of magnetic field at a point directly below it ?

A current flows in a conductor from west to east. What is the direction of the magnetic field at a point below the conductor?

A horizontal power line carries a current from east to west direction. What is the direction of the magnetic field due to the current in the power line at a point above and at a point below the power line ?

What are magnetic field lines ? How is the direction of a magnetic field at a point determined ?