If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:

The north-south polarities of an electromagnet can be found easily by using:

The direction of current in the coil at one end of an electromagnet is clockwise. This end of the electromagnet will be:

The most suitable material for making the core of an electromagnet is:

The magnetic effect of current was discovered by: