we will go through activity 15.4 class 8 science chapter 15 Some Natural phenomena. You should also go through activity 15.3 of chapter 15. In this activity 15.4, we will discuss the device which detects whether a body is charged or not.
Activity
· 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 can be inserted.
· Open
out the paper clip.
· Cut
two strips of aluminum foil about 4 cm × 1 cm each.
· Hang them on the paper clip.
· Insert
the paper clip in the cardboard lid so that it is perpendicular to it.
· Charge a refill and touch it with
the end of the paper clip.
· Observe
what happens.
· Is
there any effect on the foil strips?
· Do
they repel each other or attract each other?
· Now,
touch other charged bodies with the end of the paper clip.
· Do
foil strips behave in the same way in all cases?
· Can
this apparatus be used to detect whether a body is charged or not?
· Can
you explain why the foil strips repel each other?
 |
| Activity 15.4 Class 8 Science Chapter 15 Solution |
Observation and explanation
After establishing the complete setup, we touch a rubbed
(charged) refill to the clip. The aluminium foils repel each other.
Why do the foils repel each other?
Because the foils receive the same charge from the charged refill through the paper
clip.
The paper clip is made up of metal and metals are good conductors
of electric current.
Every time we touch the paper clip with any rubbed-charged
body, the foils repel each other. This apparatus or setup can be used to detect
whether an object carrying current or not. This is called an electroscope.
Conclusion
The activity describes the setup that detects whether a
body is charged or not.
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