Question 18

Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in the figure.

What inference could he draw from this observation? Explain.

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Solution

When a magnet is kept closer to the iron bar, magnetic properties are induced in it. It acts like a magnet till the magnet is kept near it. When the magnet is moved apart, the iron bar will lose its magnetic properties and fails to attract the iron nail.

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A person observes that a magnet attracts the iron bar when kept next to it. What inferences could be drawn from this observation?

Question 9

Boojho dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filings got stuck to the magnet as shown.

(i) Which regions of the magnet have more iron filings sticking to it?
(ii) What are these regions called?

Question 20 (a)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.

How many mirrors should he use to see the objects?

Question 20 (b)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.

Indicate the positions of the mirrors in the figure.

Question 20 (d)

Boojho planned an activity to observe an object A through pipes as shown in the figure, so that he could see objects which he could not directly see.

Indicate the direction of rays in the figure.

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Making a Magnet

Standard VI Physics

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Question 18 Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in the figure. What inference could he draw from this observation? Explain.

When a magnet is kept closer to the iron bar, magnetic properties are induced in it. It acts like a magnet till the magnet is kept near it. When the magnet is moved apart, the iron bar will lose its magnetic properties and fails to attract the iron nail.

Question 18

Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in the figure.

What inference could he draw from this observation? Explain.