NCERT Class VI Science Solutions: Chapter 13-Fun with Magnets Part 3

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Question 7:

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

Answer:

Hang up the magnet by a light thread so that it hangs freely. When it comes to rest, we notice that the magnet is lying in a North - South direction.

Image shows Geographic North - South direction

Geographic North - South Direction

Question 8:

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

Answer:

  • Take a rectangular piece of iron bar.

  • Take a bar magnet and keep in contact with one of its poles with one edge of the bar of iron.

  • Without lifting the bar magnet, move it along the length of the iron bar till you reach the other end.

  • Lift the magnet and bring the pole (the same pole you started with) to the same point of the iron bar from which you began.

  • Move the magnet again along the iron bar in the same direction as you did before. Repeat this process about 30-40 times.

  • Bring few all pins near to the iron bar and check if it is converted to a magnet or not.

As showing in images is a iron bar converted to magnet

Iron Bar Converted to Magnet

Question 9:

How is a compass used to find directions?

Answer:

A compass is usually a small box with a glass cover on it. A magnetised needle is pivoted inside the box, which can rotate freely. The compass also has a dial with directions marked on it.

The compass is kept at the place where we wish to know the directions. Its needle indicates the north-south direction when it comes to rest. The compass is then rotated until the north and south marked on the dial are at the two ends of the needle. To identify the north-pole of the magnetic needle, it is usually painted in a different colour.

As showing in images is a result for compass

Compass

Question 10:

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.

Match column 1 with column 2 Ques

Column I

Column II

Boat gets attracted towards the magnet

Boat is fitted with a magnet with north

pole towards its head

Boat Is not affected by the magnet

Boat is fitted with a magnet with south

pole towards its head

Boat moves towards the magnet if 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

north pole is brought near its head

Boat is made of magnetic material

Boat floats without changing its direction

Boat is made up non-magnetic material

Answer:

Match column 1 with column 2

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 up non-magnetic material

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

Boat is fitted with a magnet with south

pole towards its head

Boat moves away from the magnet when

north pole is brought near its head

Boat is fitted with a magnet with north

pole towards its head

Boat floats without changing its direction

Boat has a small magnet fixed along its length