Question

I need help
In studying the cross section of a straight current carrying wire, you notice that the magnetic
field lines run counter-clockwise. What is the direction of the current in the wire and how do you
know?
2. You are looking into a current carrying solenoid and notice that the compass needle indicates
that you are at the South end of the magnetic field. What is the direction of the current in the coil
and how do you know?

Answer 1

Use right hand rule.