If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

## Class 10 Physics (India)

### Unit 3: Lesson 1

Electric current & circuit

# Intro to charge

Let's explore what electric charges are.  Created by Mahesh Shenoy.

## Want to join the conversation?

• sir how do we know hair loose electron and balloon gain electron?
• It is conventional i.e. there is no proof they are just universally accepted around the world so that there are no differences among ourselves...
• if all physical substances are made of atoms why do different substances have different physical properties? and why is it that electrons still revolve around the nucleus even though they are opposite charges?
• For your first question, "If all physical substances are made of atoms why do different substances have different physical properties?"
Ans: The difference in the number of protons and neutrons in atoms accounts for many of the different properties of the elements.

Not sure if you have a typo, but in answer to your second question, "Why is it that electrons still revolve around the nucleus even though they are opposite charges?"
Ans: The electrons are attracted to the nucleus BECAUSE they are oppositely charged.
Remember, opposites attract.

Hope this helps.
:D
• If Proton and Electron have equal and opposite charges, Why don't they just annihilate each other?

And if there are protons inside the nucleus and we know that +ve repels +v then how do they still stay together in there?
• As for your first question, various factors like centripetal force, centrifugal force, etc. come into play and electrons revolve around protons. Electrons and protons have equal charges which is why the atom as a whole is neutral. Plus annihilation only occurs when 2 particles have the same mass but opposite charge. The mass of a proton (1.67 X 10^-27) is not equal to the mass of an electron (9.1 X 10^-31). Annihilation occurs between electron and positron, and proton and antiproton, but not electron and proton.
Your second question is very valid. Protons must repel each other, theoretically. However, they are held together with the neutrons in the nucleus, by nuclear forces.
• Why does this charge exist around a proton but not a neutron ?
• it is the effect of the quark triplets present in these subatomic particles. A proton has an up-up-down configuration while a neutron has one up and two down quarks (up-down-down)
• Are the things in an object infinite? Like in an object there are atoms. and in an atom - there are electrons, protons, etc.: and in protons, there are quarks: so are there stuff inside quarks?
• Why is it that the hair loses electrons? Could it be the other way round?
• At he tells that all the atoms are ALMOST made up of electron, proton, and neutron, aren't all the atoms made up of these three??
(1 vote)
• Protium is a isotope of Hydrogen and consists of of one proton and one electron.