How is a magnetic compass useful?

Find out the applications of electromagnets.

Some of the facts that you have learnt till now are listed below. Tick (✓) the facts that are correct and cross (x) the facts that are incorrect.

(a) Permanent magnets are usually made of steel.

(b) Temporary magnets are usually made of iron and nickel.

(c) Magnets can be made using electricity.

(d) Magnetic lines of force rarely form closed continuous curves.

(e) Demagnetisation is achieved only by hammering.

Fill in the blanks.

(a) …………… magnets are weak and …………… magnets are strong.

(b) …………… is a true test for magnetism.

(c) Magnets that retain their magnetism for a short period of time are called …………… magnets.

(d) During demagnetisation, the …………… of the molecules of the magnet leads to loss of magnetism.

(e) The soft iron strips that are used in storage of magnets are called …………… .