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Electric Charge and Illustrating Charging by Rubbing Video Lecture - Class 8

FAQs on Electric Charge and Illustrating Charging by Rubbing Video Lecture - Class 8

1. What is electric charge?

Ans. Electric charge is a fundamental property of matter that causes particles to experience electrical forces. It can be either positive or negative, and like charges repel while opposite charges attract each other.

2. How is charging by rubbing illustrated?

Ans. Charging by rubbing is a process where two objects are rubbed together, causing the transfer of electrons between them. One object gains electrons and becomes negatively charged, while the other loses electrons and becomes positively charged. This can be illustrated by rubbing a balloon against a woolen cloth, which transfers electrons and causes the balloon to stick to surfaces.

3. How can an object gain or lose electric charge?

Ans. An object can gain or lose electric charge through various processes. It can gain charge by contact with a charged object, by induction, or by rubbing against another object. Similarly, it can lose charge by grounding or by contact with a neutral object.

4. What are the effects of electric charge?

Ans. Electric charges can exert forces on each other, causing objects to attract or repel each other. This is known as the electrostatic force. Electric charges also create electric fields around them, which can influence the behavior of other charged objects in their vicinity.

5. What are some examples of everyday objects that are charged by rubbing?

Ans. Everyday examples of objects that can be charged by rubbing include rubbing a plastic comb against dry hair, rubbing a glass rod with a silk cloth, or rubbing a PVC pipe against a piece of fur. In each case, the rubbing causes the transfer of electrons, resulting in the objects becoming charged.

Text Transcript from Video

Topic: Electric Charge.
How does a plastic comb attract paper?
What?
You don't believe me?
Ok.
Let us try.
Take a plastic comb and bring it close to
some pieces of paper.
Hey, Wait.
Don't laugh.
We need to do something first.
Rub the comb on your dry hair and then bring the comb close to the pieces of paper.
See, I was correct.
The pieces of paper got attracted to the plastic comb.
Do you think it is magic?
No, the reason behind this is electric charge.
Electric charge is the quantity of electricity held in an object.
There are 2 types of electric charges, positive and negative.
However, there are some objects where the positive and negative charges are equal to one another.
In such cases, we say that the object is electrically neutral.
So, was the plastic comb initially electrically neutral or electrically charged?
Initially, the plastic comb was electrically
neutral.
That means it had equal number of positive and negative charges.
Hence, it did not have the ability to exert
a force and attract the pieces of paper.
So, after rubbing the plastic comb on our
dry hair, why was it able to attract the pieces of paper?
I will tell you why.
When we rubbed the plastic comb on our dry hair, it gained an electric charge.
Once it got electrically charged.
It got the ability to exert a force on the pieces of paper and attract them.
This charge is called as static electricity.
However, do you think, like a plastic comb,
a metallic comb will also attract the pieces of paper?
No, you are wrong.
A metallic comb will not attract the pieces
of paper like the plastic comb.
Wondering why is that so?
It is because plastic is not a good conductor of electricity.
It does not allow the electric charges to
flow through it onto the earth.
As a result, the charges build in the plastic comb.
Making it electrically charged and enabling it to attract the pieces of paper.
However, metal is a good conductor of electricity.
It does not let the charges build in it.
It allows the electric charges to flow through it onto the earth.
Thus, not allowing the metallic comb to get electrically charged.
As a result, the metallic comb does not attract the pieces of paper.

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Sep 23, 2025 Last updated

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