Describe with the help of a diagram an instrument which can be used to

1.	Describe with the help of a diagram an instrument which can be used to detect a charged body.Take an empty jam bottle. Take a piece of cardboard slightly bigger in size than the mouth of the bottle.Pierce a hole in it so that a metal paper clip could be inserted.Open out paper clip as shown in the figure.Cut two strips of aluminium foil about 4 cm x 1 cm each and hang them on the paper clip.Insert the paper clip having the strips of aluminium foil in to the cardboard lid so that it is perpendicular to it as shown in the figure.Change a refill and make it touch the end of the paper clip. Observe what happens.a) Is there any effect on the strips of aluminium foil?b) Do they repel each other or attract each other?c) Now bring other charged bodies and make them touch the end of the paper. Do the foil strips behave in the same way in all cases?d) Can this apparatus be used to detect the presence of charge on a body or not?e) Can you explain why the strips repel each other?f) Why does it happen?
Answer» a) Yes b) They repel each other. c) Yes, it behave in the same way in all cases. d) Yes, it is used to detect the presence of charge on a body. e) The strips of aluminium foil receive the same charge from the charged refill through the paper clip. The strips carrying similar charges repel each other and hence they move apart. This device can be used to test whether an object is carrying charge or not. This device is known as electroscope. In the above activity you can observe that electric charge can be transferred from a charged object to another through a metal conductor. Touch the end of the paper clip gently with hand and you will find a change in the foil strips they move closer and come back to their original state. f) The reason is that the foil strip lose charge to the earth through your body. We say that the foil strips are discharged. The process of transferring of charge from a charged object to the earth is called earthing.

Describe with the help of a diagram an instrument which can be used to detect a charged body.Take an empty jam bottle. Take a piece of cardboard slightly bigger in size than the mouth of the bottle.Pierce a hole in it so that a metal paper clip could be inserted.Open out paper clip as shown in the figure.Cut two strips of aluminium foil about 4 cm x 1 cm each and hang them on the paper clip.Insert the paper clip having the strips of aluminium foil in to the cardboard lid so that it is perpendicular to it as shown in the figure.Change a refill and make it touch the end of the paper clip. Observe what happens.a) Is there any effect on the strips of aluminium foil?b) Do they repel each other or attract each other?c) Now bring other charged bodies and make them touch the end of the paper. Do the foil strips behave in the same way in all cases?d) Can this apparatus be used to detect the presence of charge on a body or not?e) Can you explain why the strips repel each other?f) Why does it happen?

Answer»

a) Yes

b) They repel each other.

c) Yes, it behave in the same way in all cases.

d) Yes, it is used to detect the presence of charge on a body.

e) The strips of aluminium foil receive the same charge from the charged refill through the paper clip. The strips carrying similar charges repel each other and hence they move apart. This device can be used to test whether an object is carrying charge or not. This device is known as electroscope. In the above activity you can observe that electric charge can be transferred from a charged object to another through a metal conductor.

Touch the end of the paper clip gently with hand and you will find a change in the foil strips they move closer and come back to their original state.

f) The reason is that the foil strip lose charge to the earth through your body. We say that the foil strips are discharged.

The process of transferring of charge from a charged object to the earth is called earthing.

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