- Charges are of two types
(a) positive charge
(b) negative charge
- like charges repel each other and unlike charges attract each other.
-Properties of charge
1. quantisation :- q=ne where n=0,۫, ........ and e is charge of an electron.
2. additivity :- qnet=Σq
3. conservation :- total charge of an isolated system is constant
The mutual electrostatic force between the charges q1 and q2 seperated by a distance r is given by
Force on the charge q1
where r12 is the unit vector in the direction from q2 to q1
similarly force on charge q2 is
where r21 is the unit vector in the direction from q1 to q2
If there are more than 2 charges present in the system then force acting on any charges is vector sum of the couloumb force from each of the other charges.This is called principle of superposition
charges are present in the system
Then Force on charge q1
Similarly for the other charges...
Important point to note on this
1. The force with which two charges interact is not changed by the presence of the other charges
2. Net force on any charge
Class 9 physics notes on chapter motion is now available at the following link CLASS 9 MOTION NOTES (FULL LENGTH)
Question1: A charge Q is divided in two parts q and Q - q separated by a distance R. If force between the two charges is maximum, find the ...
Coherent sources are those sources of light which emit continous light waves of same wavelength , same frequency and are in same phase or h...
Our New Free physics ebooks (pdfs) are available at this link . Hope you lile them.
Unit I: Physical World and Measurement (Periods 10) Physics: Scope and excitement; nature of physical laws; Physics, technology and society...
ADVANTAGES The generation of A.C. is cheaper than that of D.C. A.C. machines are simple , robust and do mot require much attention for the...
Hi all here in this article i am giving some tips and tricks to solve problems in mechanics. To master problem solving skill you need to pra...
1.A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement x i...
Many times i have had users ask me a question which book to opt between H.C Verma Concepts of physics and NCERT physics books . My answer ...
Unit I: Electrostatics (Periods 25) Electric charges and their conservation. Coulomb’s law – force between two point charges, forces betwee...