NCERT Solutions for Class 6 Science Chapter 13 : Fun with Magnets

Q:

How is a compass used to find directions?

A:

A compass has a magnetic needle which can move around a pivot. As a magnet always stays in north-south direction hence, this property of magnet is used to find the directions with the help of a compass.

Q:

You are given an iron strip. How will you make it into a magnet?

A:

 To convert an iron strip into a magnet, place the iron strip on the table. Now, rub a permanent magnet on the strip. While doing this, the movement of your hand should always be in the same direction.  After doing this 40–50 times, the iron piece would attain magnetic properties.

Q:

Where are poles of a bar magnet located?

A:

There are two poles of a magnet namely North pole and South pole. They are located at the two ends of the magnet.

Q:

Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
Column I Column II
N-N _______
N- ___ Attraction
S-N _______
__- S Repulsion

A:

Column I

Column II

N-N

Repulsion

N-S

Attraction

S-N

Attraction

S-S

Repulsion

Q:

A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?

A:

The poles of a bar magnet with no marking can be identified by suspending the bar magnet freely with the help of a light thread. A freely suspended bar magnet always comes to rest in the North−South direction.The north facing end of the magnet indicates its north pole while the south facing end indicates its south pole.

Q:

Write any two properties of a magnet.

A:

Two properties of a magnet are:

i. Unlike poles of two magnets attract each other.

ii. Like poles of two magnets repel each other.

Q:

It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.

A:

In a pencil sharpener, the blade is made of iron and iron is a magnetic material. Magnets have tendency to attract the objects made of iron. Hence, a pencil sharpener gets attracted towards both the poles of a magnet.

Q:

State whether the following statements are true or false: (i) A cylindrical magnet has only one pole. (ii) Artificial magnets were discovered in Greece. (iii) Similar poles of a magnet repel each other. (iv) Maximum iron filings stick in the middle of a bar magnet when it is brought near them. (v) Bar magnets always point towards North-South direction. (vi) A compass can be used to find East-West direction at any place. (vii) Rubber is a magnetic material.

A:

(i) A cylindrical magnet has only one pole. (False)

    Explanation: A magnet cannot exist with a single pole. A magnet always exists with two poles. Hence, a cylindrical magnet has also two poles.

(ii) Artificial magnets were discovered in Greece. (False)

(iii) Similar poles of a magnet repel each other. (True)

       Explanation: Like poles of magnets repel each other, while unlike poles of magnets attract each other.

(iv) Maximum iron filings stick in the middle of a bar magnet when it is bought near them. (False)

      Explanation: The magnetic strength of a bar magnet is maximum at its two poles and minimum at middle. Hence, maximum iron filings will stick at two ends of the magnet and minimum in the middle.

(v) Bar magnets always point towards the North−South direction. (True)

(vi) A compass can be used to find the East−West direction at any place. (True)

      Explanation: We know that a magnetic compass always points towards the North−South direction. If the North−South direction is known, then the East−West direction can be found.

(vii) Rubber is a magnetic material. (False)

       Explanation: Rubber is a non-magnetic material as it is not attracted by a magnet.

Q:

A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case is stated in Column I. Possible reasons for the observed affects are mentioned in Column II. Match the statements given in Column I with those in Column II.
Column I Column II
Boat gets attracted towards the magnet Boat is fitted with a magnet with the north pole towards its head
Boat is not affected by the magnet Boat is fitted with a magnet with the south pole towards its head
Boat moves towards the magnet when the north pole of the magnet is brought near its head Boat has a small magnet fixed along its length
Boat moves away from the magnet when the north pole is brought near its head Boat is made of magnetic material
Boat floats without changing its direction Boat is made of a non-magnetic material

A:

Column I

Column II

Boat gets attracted towards the magnet

Boat is made of magnetic material

Boat is not affected by the magnet

Boat is made of a non-magnetic material

 

Boat moves towards the magnet when the north pole of the magnet is brought near its head

Boat is fitted with a magnet with the south pole towards its head

 

Boat moves away from the magnet when the north pole is brought near its head

Boat is fitted with a magnet with the north pole towards its head

 

Boat floats without changing its direction

Boat has a small magnet fixed along its length

Q:

Fill in the blanks in the following (i) Artificial magnets are made in different shapes such as __________, __________ and ____________. (ii) The Materials which are attracted towards a magnet are called ________. (iii) Paper is not a ______ material. (iv) In olden days, sailors used to find direction by suspending a piece of ___________. (v) A magnet always has __________ poles.

A:

 

(i) Artificial magnets are made in different shapes such as bar magnets, horse-shoe magnets, and cylindrical magnets.

(ii) Materials which are attracted towards magnets are called magnetic materials.

(iii) Paper is not a magnetic material.

(iv) In olden days, sailors used to find direction by suspending a piece of bar magnet.

      Explanation: The sailors used to find direction by suspending a piece of bar magnet because a freely suspended magnet always comes to rest in the North-South direction.

(v) A magnet always has two poles.

     Explanation: A magnet consists two poles namely the South pole (S) and the North pole (N).

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