Physics
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 …………… .
Answer
(a) Permanent magnets are weak and temporary magnets are strong.
(b) Repulsion is a true test for magnetism.
(c) Magnets that retain their magnetism for a short period of time are called temporary magnets.
(d) During demagnetisation, the disorientation 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 magnetic keepers.
Related Questions
Do you think the strength of the magnet will get affected if you travel with it to a hotter city? Why?
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.
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.
Which method of making magnets involves the use of two magnets?
- Single touch method
- Double touch method
- Magnetic induction
- Electrical method