The magnetic field produced by a current-carrying straight wire at a point outside the wire depends

The magnetic field inside a long straight solenoid-carrying current

The rule that determines the direction of a magnetic field produced around a straight conductor carrying current is :

The magnetic field lines inside a current carrying long solenoid are in the form of

A current through a horizontal power line flows in east to west direction. What will be the direction of magnetic field at a point directly below it when viewed from east end?

An AC current can be produced by