02. Static Electricity
2.1Charging an object
Cut several pieces of dry paper and place them on a table. Rub a plastic pen against your dry hair and hold the pane close to the pieces of paper.
What can your observations?
*Observation-Pieces of paper are attracted to the pen.
*Conclusion- Light thinds are attracted to rubbed objects.
*Light things do not attract to objects before rubbing.
*The scientist William Gilbert(1600 AD) was the first to reveal that light things are attracted to rubbed objects.
2.2 Types of static electric charges
- When some objects are rubbed, electric charges are generated on them.
- Electric charges generated on the surface of objects by rubbing, are called static electric charges.
Activity 2.2
Observations:-
Reason:- There are attractions as well as repulsions between charged objects.
Attractions and repulsions
*Two types of static electric charges.
- Positive(+) electric charges
- Negative(-) electric charges
*Objects with unlike electric charges attract each other.
*Therefore, a glass rod rubbed with silk gains positive static electric charges and ebonite rod rubbed with wool gains negative static electric charges.
When the objects are rubbed against each other negatively charged particles remove from one object to the other object.
The object from which negatively charged particles are removed,is charged positively, and the object that gained negatively charged particles is charged negatively.
The process takes place when a pair of objects are rubbed against each other can be illustrated as follows.
*It is clear to you when two objects are rubbed with each other, one object is positively charged while the other is negatively charged.
Neutralization of charged objects due to the exchange of static electric charges.
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