Introduction
Chapter Name : Electric Charges And Fields |
Sub Topic Code : 101_12_01_01_01 |
Topic Name : Introduction |
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Sub Topic Name : Introduction |
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Introduction
Discuss charges produced when you rub one insulating material with another.
Pre-Requisites:
Introduction to charging by rubbing.
Activity:
Try rubbing a plastic refill with polythene or a balloon with dry hair, and discuss the charges induced.
Real Life Question:
“Why does a comb attract pieces of paper when we comb our dry hair with it?” “Why do we get a little sensation of shock when we touch an iron door of refrigerator after long time?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Static Electrostatics | Which do not move on their own. Branch of science which deals with charges and their effects |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Normal domestic things | Comb your dry hair and take that comb near pieces of paper. |
Real life uses :
Generation of spark on removing the woolen clothes, lightning
Places to visit :
You have enough material at home to see the science behind it.
Practical examples around us
| Examples | Explainations |
|---|---|
| Lightning Generation of spark on removing the woolen clothes. | Generation of charges in the clouds due to rubbing. There is generation of charges when our hair gets in contact with woolen fur, on removing clothes. |
What you learn in Theory:
Charges can be induced by rubbing also and these charges are static in nature. Branch of science which deals with the charges and their effects is called Electrostatics.
What you learn in Practice:
Charges do not move on their own, we need to have contact between charged and uncharged body to flow of current.