The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is:

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:

The magnetic field lines in the middle of the current-carrying solenoid are :

The back face of a circular loop of wire found to be south magnetic pole. The direction of current in this face of the circular loop of wire will be:

In the straight wire A, current is flowing in the vertically downward direction whereas in wire B the current is flowing in the vertically upward direction. What is the direction of magnetic field:

(a) in wire A?

(b) in wire B?

Name the rule which you have used to get the answer.