Physics
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.
Magnetism
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Answer
(a) ✓
(b) ✓
(c) ✓
(d) x
Corrected fact — Magnetic lines of force always form closed continuous curves.
(e) x
Corrected fact — Demagnetisation is achieved by following methods :
- By rough handling
- By dropping the magnet on the floor or on a hard surface a number of times
- By hammering the magnet repeatedly
- By heating the magnet to a very high temperature
- By passing alternating electric current around the magnet
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(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 …………… .
State whether the following statements are true or false. Correct the false statements.
(a) Both the poles of the magnet exist in pairs.
(b) The strength of the magnetic field of a magnet increases as we move away from it.
(c) Magnetic lines of force may intersect one another.
(d) Magnetic induction is a temporary method of making magnets.
(e) The magnet remains unaffected even if handled roughly.