Class 6 Science

Chapter 4 Solutions — Exploring Magnets

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Solutions

Overview

Step-by-step NCERT solutions for Exploring Magnets (Chapter 4, NCERT Class 6 Science) — every question and answer worked out in full, not just the final result. You can also read the Exploring Magnets textbook chapter.

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What these solutions cover

All 11 questions in Exploring Magnets are solved in the PDF. Here's what's inside, exercise by exercise:

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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.
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.
- (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.
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. Fill in the blanks. Column I: N–N, N–?, S–N, ?–S. Column II: (blank), Attraction, (blank), Repulsion.
4.
Atharv rolled a bar magnet over a heap of steel U-clips (Fig. 4.15). The positions A, B, and C are along the magnet. Which option from Table 4.3 (number of pins at each position) is likely to be his observation? Options:
- (i) A=10, B=2, C=10;
- (ii) A=10, B=10, C=2;
- (iii) A=2, B=10, C=10;
- (iv) A=10, B=10, C=10.
Reshma bought three identical metal bars. Two are magnets and one is just a piece of iron. How will she identify which two are 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?
While a mechanic was repairing a gadget using a screwdriver, 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.
Two ring magnets X and Y are arranged as shown in Fig. 4.16. It is observed that magnet X does not move down further. What could be the possible reason? Suggest a way to bring magnet X in contact with magnet Y, without pushing either of the magnets.
Three magnets are arranged on a table in the form of a shape shown in Fig. 4.17. What is the polarity (N or S) at ends 1, 2, 3, 4, and 6 of the magnets? The polarity of end 5 is given as N.

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Worked examples

3 questions from Exploring Magnets, solved step by step.

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Reshma bought three identical metal bars. Two are magnets and one is just a piece of iron. How will she identify which two are magnets (without using any other material)?

The chapter states: 'a magnet can be identified by its property of repulsion.'

Method:

Step 1: Pick any two bars — call them X and Y. Bring one end of X near each end of Y.

Step 2: If they repel at some position, both X and Y are magnets (repulsion only happens between two magnets).

Step 3: If X and Y attract at both ends but never repel, one of them is the iron bar. Then test X against the third bar Z. If X and Z repel, X and Z are the two magnets.

Key principle: An iron bar is attracted to both poles of a magnet but never causes repulsion. Two magnets will repel when like poles face each other.

By testing pairs until repulsion is observed, the two magnets are identified.

Answer: Test pairs for repulsion. Two bars that repel each other (when like poles face) are both magnets. The iron bar attracts to magnets but never repels them.

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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?

Use the known magnet (with N and S marked) to test each end of the unknown magnet.

Step 1: Bring the N pole of the known magnet near one end of the unknown magnet.

Step 2: If the unknown magnet's end is attracted, that end is the South pole (unlike poles attract).

Step 3: If the unknown magnet's end repels, that end is the North pole (like poles repel).

Step 4: The other end is the opposite pole.

This works because repulsion is the definitive test for like poles between two magnets.

Answer: Bring the marked N pole near each end of the unknown magnet. The end that repels is the North pole; the end that attracts is the South pole.

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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?

The chapter states: 'A freely suspended magnet comes to rest along the north-south direction. The end of the magnet that points towards north direction is called the North pole.'

Method:

Step 1: Tie a thread to the middle of the bar magnet and suspend it freely so it can rotate horizontally.

Step 2: Allow it to come to rest on its own.

Step 3: Using the direction where the Sun rises (East) or sets (West) as a reference, identify the North direction.

Step 4: The end of the freely suspended magnet pointing toward the North is its North pole.

Answer: Suspend the magnet freely by a thread. When it comes to rest, the end pointing toward geographic North is the North pole.

All 11 questions in Exploring Magnets are solved step by step in the Solutions PDF above.

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Chapter 4 Solutions — Exploring Magnets

Overview

What these solutions cover

Let Us Enhance Our Learning

Worked examples

Reshma bought three identical metal bars. Two are magnets and one is just a piece of iron. How will she identify which two are 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?

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