Question

are attracted by a (a) Artificial magnets were discovered in Greece (b) A cylindrical magnet has only one pole. (c) Maximum iron filings stick in the middle of a bar magnet when it is brought near them (d) Rubber is a magnetic material. (e) A nickel wire is attracted by a magnet. Similar poles of the magnets repel each other. (3) A freely suspended bar magnet always points along East-West direction (h) Freely suspended bar magnets always point towards North-South direction (1) A compass can be used to find East-West direction at any place 0) A compass needle is a magnet. tahire words​

Answer 1

Answer:

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Explanation:

Complete step by step solution : We traced the origin of the science of magnetism and its substituent growth. A Greek philosopher Thales of Miletus had discovered a naturally occurring ore of iron attracted small pieces of iron towards it. The ore was found in the district of magnesia in Asia Minor in Greece.

Answer 2

Q1:Fill the blanks:

(i) The shapes in which artificial magnets can be made are _______, _______ and _______.

(ii) _______ materials are attracted towards magnet.

(iii)Paper is not _______.

(iv) A few centuries ago, sailors used a suspended piece of _______ to find direction.

(v) There are bound to be ________ poles in a magnet.

KEY

(i) horse-shoe, bar, cylindrical.

(ii) magnetic materials.

(iii) magnetic

(iv) bar magnet or lode stone

(v) a pair or two

Q2:True or False

(i) There is only one pole in a cylindrical magnet.

(ii) The natural magnets were first discovered in Greece.

(iii) In a magnet, similar poles repel each other.

(iv) When a bar magnet is brought near a pile of iron filings, they tend to stick at the middle of the bar magnet rather than the ends.

(v) A bar magnet when suspended freely in air always point in the North-South direction.

(vi) A compass can also be used to find East-West direction at any location.

(vii) Plastic is a magnetic material.

Key

(i) False

(ii) True

(iii) True

(iv) False

(v) True

(vi) True

(vii) False

Q3:Pencil sharpener is attracted to both poles of a magnet although the sharpener’s body is made of plastic. Identify the material which may be the reason for the above phenomena that might have been used to make some part of the sharpener.

Ans: Iron is used to make the blade in the sharpener due to which it is attracted towards magnet.