we will go through activity 15.3 class 8 science chapter 15 Some Natural phenomena. You should also go through activity 15.2 of chapter 15. In this activity 15.3, we will learn about the nature of the electric charge and charged bodies.
Activity
· (a)
Inflate two balloons.
· Hang
them in such a way that they do not touch each other.
· Rub
both the balloons with a woolen cloth and release them.
· What
do you observe?
· Now
let us repeat this activity with the used pen refills.
· Rub one refill with polythene.
· Place
it carefully in a glass tumbler using the tumbler as a stand.
· Rub
the other refill also with polythene.
· Bring
it close to the charged refill.
· Be
careful not to touch the charged end with your hand.
· Is
there any effect on the refill in the tumbler?
· Do the two attract each other, or repel each
other?
· In
this activity, we have brought close together the charged objects that were made
of the same material.
· What
happens if two charged objects made of different materials are brought close to
each other?
· Let’s
find out.
· (b)
Rub a refill and place it gently in a glass tumbler as before.
· Bring
an inflated charged balloon near the refill and observe.
Observation and explanation
An inflated balloon repels another inflated balloon
because both balloons are made up of the same material. So they have similar charges
on them.
When a charged refill is brought near another charged
refill, they repel each other. The reason is the same- both refills are made up
of the same material so they have a similar charge.
Similarly charged bodies repel each other.
Now we rub an inflated balloon and refill. When the
balloon is brought near the refill, they attract each other.
It happens because both are made of different
materials and have different charges on them.
Conclusion
This activity shows that like charges repel each other and unlike charges attract each other.
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