Balbharati solutions for General Science Integrated [English] Standard 6 Maharashtra State Board chapter 15 - Fun with Magnets [2023 edition]

Pins in a pin holder do not fall even when it is held upside down. Why is this so?

While we are shutting the door of a fridge, we find that it closes automatically from a certain distance and does not open unless pulled again. Why is this so?

Take a magnet from the laboratory and bring it near various objects in your use. Which of them sticks to the magnet? What material is each of them made of? Observe these things carefully. Classify the objects into two groups: those which stick to the magnet and those which do not.

Take a mixture of sand, pieces of paper, sawdust, iron filings and pins in a saucer and pass a magnet around the mixture. What do you see?

How is a mariner's compass used?

Determine the directions in the class or laboratory. Tie a thread to the centre of a bar magnet and hang it from a stand. Note the direction in which the magnet settles and turn it around again. Let it settle and note the direction. Do this many times. What do you observe?

Place some iron filings on a sheet of paper and pass a bar magnet over them. Pick up the bar magnet by holding it in the centre. What do you see?

Take a bar magnet that can be cut with scissors or a knife. Take iron filings on a sheet of paper and place the magnet on it. Most of the iron filings will be seen to stick to its poles.

Now cut the magnet into two pieces as shown in the picture and place those pieces on iron filings. Pick up each of the pieces and observe them. What do you find?

Fix a powerful bar magnet to a stand as shown in the figure. Fix an iron bar at a short distance below the magnet. Take iron filings near the iron bar. What do you see?

After some time, take the magnet away. What happens now?

Iron filings stick to the iron bar when the magnet is near it and fall off as soon as the magnet is taken away. That is, the magnetism in the bar vanishes.

Fix a bar magnet to a stand as shown in the figure. Let it become steady. Take another bar magnet near the hanging bar magnet. Observe what happens. Do the same again and again, exchanging the ends of the magnet. What do you see?

Take a needle or nail. Place it steady on a table. Keep on rubbing a magnet over it from one end to the other. Do this 7-8 times. Now take a few pins near that needle/nail. What is seen?

In this way, magnetic objects acquire magnetism. Magnetism of this kind is temporary. It lasts for a short while.

How will you do this?

Determine whether a material is magnetic or non-magnetic.

How will you do this?

Explain that a magnet has a certain magnetic field.

How will you do this?

Find the north pole of a magnet. 

Which magnet will you use?

Iron is to be separated from trash.

Which magnet will you use?

You are lost in a forest.

Which magnet will you use?

A window shutter opens and shuts continuously in the wind.

If a bar magnet is hung by a thread tied at its center, its north pole becomes steady in the direction of the ______ Pole of the earth.

If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two places, ______ bar magnets are formed, and a total of _____ poles are formed.

There is repulsion between the _____ poles of a magnet and attraction between its _____ poles.

When magnetic material is taken close to a magnet, the material acquires ______.

If a magnet attracts a piece of metal, that piece must be made of ______.

A magnet remains steady in a ________ direction.

Write the answer in your words.

How is an electromagnet made?

Write the answer in your word.

Write the properties of a magnet.

Write the answer in your word.

What are the practical uses of a magnet?