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

The magnetic effect of current was discovered by:

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

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:

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: