Question

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1. What is a lodestone ?
2. What is a natural magnet ? State two limitations of
a natural magnet.
11. Es
3. What is an artificial magnet ? State two reasons why
(a
do we need artificial magnets.
4. How will you test whether a given rod is made of
iron or copper?
[Hint : Iron rod gets magnetised when placed near
a bar magnet by magnetic induction, while copper
rod does not get magnetised]
5. You are provided with two similar bars, one is a
12
magnet and the other is a soft iron bar. How will
you distinguish between them without the use of any
other magnet or bar ?
hot when suspended freely will rest​

Answer 1

Answer:

1. Lodestone is a naturally magnetized piece of mineral magnetite they are naturally occuring magnets which can attract iron.

2.Natural magnet is a ore of iron that attract small piece of iron ,cobalt and nickel etc.

Limitation of natural magnet

1 they have poor magnetic property due to which their attraction power is low.

2 they are not found everywhere and not easily accessible by everyone.

3. Artificial magnet is that prepared artifically by people. EX include an electromagnet, bar magnets etc.

Reasons

1 we need to lift heavy weight.

2 another reason natural magnet are not strong than artificial magnet.

4. To test whether a give rod is made up of iron or cooper simply place near a bar magnet iron rod gets magnetized when place near a bar magnet due to magnetic induction while cooper rod does not get magnitized.

5. Given two material let us suspend them freely from a vertically pole and observe it carefully when they come to rest a magnet when suspended freely will rest only in north south direction according to earth magnetic field but the soft iron bar will rest in any direction.

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