Chapter 4 Exploring Magnets
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NCERT Class 6 Science (Curiosity) Chapter 4. Exploring Magnets
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NCERT Class 6 Science (Curiosity) Chapter 4. Exploring Magnets
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NCERT Class 6 Science (Curiosity) Chapter 4. Exploring Magnets
Question 1: Do magnets stick to objects made of certain materials only? (Page 62)
Answer:
Yes, magnet attracts certain materials whereas some do not get attracted towards magnet. The materials which get attracted towards a magnet are magnetic e.g. iron, nickel, cobalt etc. The materials which are not attracted towards a magnet are non-magnetic. In their natural states, metals such as aluminium, brass, copper, gold, lead and silver do not attract magnets.
Question 2: Do all parts of a magnet attract magnetic materials equally? (Page 64)
Answer: No, all parts of a magnet do not have equal magnetic strength. In a bar magnet, the magnetic field around the poles is stronger than the middle part, where the magnetic field is weaker. Also in case of horseshoe magnet, the magnetic strength is higher near the poles.
Question 3: Can we find a magnet with a single pole? (Page 65)
Answer: No, any magnet has always two poles namely north and south. We cannot make a magnet with only one pole.
Let us enhance our learning (pages 74-76)
Question 1.
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.
Answer:
(i) attract, repel
(ii) magnetic materials
(iii) north-south
(iv) two
Question 2.
State whether the following statements are True (T) or False (F).
(i) A magnet can be broken into pieces to obtain a single pole.
Answer: False
(ii) Similar poles of a magnet repel each other.
Answer: True
(iii) Iron fiings mostly stick in the middle of a bar magnet when it is brought near them.
Answer: False
(iv) A freely suspended bar magnet always aligns with the north-south direction.
Answer: True
Question 3. 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.
Question 4.
Atharv performed an experiment in which he took a bar magnet and rolled it over a heap of steel U-clips
Answer:
Bar magnet and heap of steel U-clips
According to you, which of the options given in Table is likely to be his observation?
Table: Number of pins attracted by the magnet at its various positions
Answer:
From the figure, it is clear that the ends of the magnet have more iron fillings attached to it. This is because the strength of a magnet lies more at the ends of the magnet. Hence option (i) is correct.
Question 5.
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)?
Answer:
Magnets both attract and repel, whereas iron only attracts. Thus, repulsion helps to find which one is the bar and which one is the magnet.
Question 6.
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?
Answer:
To find the poles of an unmarked magnet, bring one end of the marked magnet near one end of the unmarked magnet. If they attract, the unmarked magnet’s end is the opposite pole (i.e., if the marked North pole attracts, then the unmarked end is South pole). If they repel, then the poles are similar.
Question 7.
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?
Answer:
When a bar magnet is suspended freely, it always rests in north-south directions. The end pointing towards north is called north seeking end or the north-pole and the end pointing towards south is called south seeking end or the south-pole of the magnet.
Question 8.
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?
Answer:
Yes, we can guess the poles of Earth’s magnet by looking at the direction of the magnetic compass. The north seeking end of the compass needle points towards the geographic North Pole of the Earth.
Question 9.
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.
Answer:
The mechanic needs to magnetise his screwdriver which will not just lift the screw but hold it in place while he works.
To magnetise a screwdriver he needs a magnet. He be advised to, “place the screwdriver on a wooden table. Then keep one end (pole) of the magnet at one end of the metallic part of the screwdriver. Move the magnet along the length of the metallic part of screwdriver. Lift it and bring the same pole of magnet to the same end of screwdriver he began, and repeat moving it over the length of the screwdriver. On repeating this process about 30 times the screwdriver will get magnetised”
Question 10.
Two ring magnets X and Y are arranged as shown in Fig. (below). It is observed that the magnet X does not move down further. What could be the possible reason? Suggest a way to bring the magnet X in contact with magnet Y, without pushing either of the magnets.
Two ring magnets
Answer:
Magnet X must be floating because the like poles are facing each other (like poles repel each other). If we change the direction of the magnet X by rotating it the unlike poles will face each other and the magnets will come closer.
Question 11.
Three magnets are arranged on a table in the form of the shape shown in Fig. (below). What is the polarity, Nor S, at the ends 1, 2, 3, 4 and 6 of the magnets? Polarity of one end (5) is given for you.
Three bar magnets
Answer:
- Collect a few objects made of different materials and also a magnet.
- Predict which of the objects will stick to the magnet. Write your prediction in Table 4.1.
- Now hold a magnet in your hand and bring it near the objects one by one
Observe which of the objects stick to the magnet.
Record your observations in Table 4.1.
Answer:
Table 4.1: Identifying the materials attracted by a magnet
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