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State and explain Coulomb's law in electrostatics.

Answer
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Hint: In presence of two or more charges there is a Force of attraction between different types of charges and repulsion between the same type of charge. Then this force is directly proportional to strength of charges and inversely proportional to the square of distance between them.

Complete step-by-step answer:
Coulomb's Law:
The Electrostatic Force of interaction between two static point electric charges is directly proportional to the product of the charges, inversely proportional to the source of the distance between them and acts along the straight line joining the two charges.
If two point charges q1 and q2 separated by a distance r.
Let F be the electrostatic force between these two Charges. According to coulomb's law
F α q1q2 and F α1r2
Fe=Kq1q2r2.
Where K = coulomb's constant or electrostatic force constant.
r = Distance between both charges.
K=14πE0=9×109NM2C2
E0= Permittivity of medium
Vector Form:
F12=Force on q1 due to q2=Kq1q2r2r21
F21=Force on q2 due to q1=Kq1q2r2r12
r12= unit vector from q1 to q2
r21= unit vector from q2 to q1

Note: The law is based on physical observation and is not logically derivable from any other concept. Experiments till today reveal its universal Nature.
The Force is conservative.
Also coulomb's law in terms of position vector
F12=Kq1q2|r1r2|3(r1r2)