Exploring Magnets

Reshma bought three identical metal bars from the market. Out of these bars, two were magnets and one was just a piece of iron. How will she identify which two amongst the three could be magnets (without using any other material)?

You are given a magnet which does not have the poles marked. How can you find its poles with the help of another magnet which has its poles marked?

A bar magnet has no markings to indicate its poles. How would you find out near which end its North pole is located without using another magnet?

If the earth is itself a magnet, can you guess the poles of earth's magnet by looking at the direction of the magnetic compass?

State whether the following statements are True (T) or False (F). (i) A magnet can be broken into pieces to obtain a single pole. (ii) Similar poles of a magnet repel each other. (iii) Iron filings mostly stick in the middle of a bar magnet when it is brought near them. (iv) A freely suspended bar magnet always aligns with the north-south direction.

Fill in the blanks (i) Unlike poles of two magnets ________ each other, whereas like poles ________ each other. (ii) The materials that are attracted towards a magnet are called ________. (iii) The needle of a magnetic compass rests along the ________ direction. (iv) A magnet always has ________ poles.

Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting interaction between them for different situations. Fill in the blanks. | Column I | Column II | | N – N | ------------- | | N – | Attraction | | S – N | ------------- | | – S | Repulsion |

While a mechanic was repairing a gadget using a screw driver, the steel screws kept falling down. Suggest a way to solve the problem of the mechanic on the basis of what you have learnt in this chapter.