How Do We Make Magnets

Om carried out an experiment to find out how the number of batteries would affect the number of paper clips attracted to the electromagnet shown below.

(a) What pattern would Om observe about the number of batteries and the number of paper clips attracted to the electromagnet? 

(b) With two batteries in the circuit, predict the number of paper clips that will be attracted to the electromagnet if the steel nail is replaced with an aluminium nail. Explain your observation. 

One student has made the strokes on steel bar using magnet, but he made the strokes in both directions, clockwise and anti-clockwise. Will he be able to magnetise the steel bar? Why?

Iron fillings are _____ by a magnetised steel bar.

How can we make magnets?

Name the material used to make temporary magnets.

A student is asked to make a temporary magnet using electricity. What will he do? Can he increase or decrease the strength of his magnet? How?

What is magnetisation? How can you magnetise a magnetic material using a magnetic material and a magnet? Explain.

Akshat had a pair of bar magnets. He kept those magnets in a box made of plastic. But, after one month, when he opened that box, he found that the strength of both magnets is reduced. What is its reason? Explain.

How is an electromagnet different from a bar magnet?

Which of the following uses electromagnets for continual motion?

Which of the following actions will not affect the magnetic properties of a magnet?