The fun facts about physics related to coulombs law. This slide is to be viewed after learning the basics of Coulombs law in Cerego. Learn here https://cerego.com/sets/745640

1. FUN FACTS, CHARMS OF PHYSICS AND MORE
Fun with Electric Charge and
Coulombs Law

2. Introduction
William Gilbert, a personal doctor to Queen
Elizabeth I of England, who gave a scientific
description of electric charges.
Benjamin Franklin, an amateur scientist explained
the nature of electric charges.
Charles Du Fay did not accept the one-fluid theory of
Franklin. It was Du Fay who suggested the
possibility of two types of charges, one positive and
the other negative.

3. THAT’S THE CHARM OF PHYSICS #1
Electric Charge is not created, just
transferred from one object to
another, during rubbing of two
bodies.

4. JUST REMEMBER THIS #1
When bodies are rubbed against each
other they become charges due to the
transfer of electrons from one body to
the other. The charge stays where it is
and hence it is called static electricity.

5. THAT’S THE CHARM OF PHYSICS #2
Any net charge kept on a metal sphere spreads uniformly over
the surface of sphere very quickly. But the net charge placed
on an insulator will remain in that region.
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6. REASON FOR CHOOSIN k AS …

7. REINVENT YOURSELF
Suppose q1q2 < 0. This means one charge is positive
and the other charge is negative. Then the electric
force between them will be attractive.
Suppose q1q2 > 0. This means the two charges are
similar, either (+) and (-). In either case the force
between them is repulsive.
If q1 + q2 = 0, then there will be force of attraction
between the two charges, even though the net
charge of the system is zero.

8. JUST REMEMBER THIS #2
Coulomb’s law can be applied to point charges.
Coulomb’s interaction is not affected by any other charge in
the surroundings.
Coulomb’s law is applicable to charges at rest. For charges
in motion, the equation must be modified.
Coulomb’s force holds good for very small distances up to
about 10-15
m. When the distance becomes less than that, the
coulomb’s force is dominated by the nuclear forces.

9. CONTD …
Coulomb’s force is a central force and hence it is an
example of conservative force. This means the work done
in moving a charge in an electrostatic field is independent
of the path followed.
The coulomb’s force exerted by one charge (q1) on another
charge (q2) is equal and opposite to the force exerted by q2
on q1. The magnitude of the force depends on the
magnitude of the charges, their separation and the nature
of the medium in between them. The direction of the force
depends upon the position of the charges.

10. CONTD …
The importance of Coulomb’s law is that.
a) It helps is to determine the forces acting between charged bodies.
b) It explores the biding force between electron and the nucleus in an
atom or molecule in solid or liquid.
Even though the protons and neutrons are held together
inside the nucleus through the strongest nuclear force
which does not depend upon the charge, it is due to electric
force that elements are radioactive and the elements are
beyond uranium are not stable.

11. HAVE FUN!!
ENJOY …