Inside a solenoid,the magnetic field is constant in magnitude and direction.

$(a)$ What is an electromagnet? What does it consist of?
$(b)$ Name one material in each case which is used to make a: $(i)$ permanent magnet $(ii)$ temporary magnet.
$(c)$ Describe an activity to show how you can make an electromagnet in your school laboratory.

The direction of the magnetic force acting on a current-carrying wire placed in a strong magnetic field can be determined by which rule?

What is a solenoid?

What is meant by electromagnetic induction?

Meena draws magnetic field lines of a field close to the axis of a current-carrying circular loop. As she moves away from the centre of the circular loop,she observes that the lines keep on diverging. How will you explain her observation?