Electric field intensity due to point charge, Electric dipole, Electric dipole moment.

Hello science lovers!
In this article you will get the answers of the following questions:

1. Expression for electric field intensity due to point charge.
2. What is electric dipole?
3. What is electric dipole moment?

So, let’s start!
Electric intensity due to a point charge: 
[What is point charge?]If the charge body is very small like a point then the charge of the body is called point charge.
Let a positive charge +q situated at a point A in a medium whose dielectric constant is K. Now, we will determine the electric intensity at a point p at a distance r from this charge

Suppose a small charge +q₀ is placed at point p.
Now, force acting charge q₀ is
F=(1/4πε₀k) (q q₀ /r²) -(i)
Hence, electric intensity at point p is 
E=F/q₀
Substituting F from equation (i) we get
E=(1/4πε₀k) (q q₀/r²q₀) 
=> E=(1/4πε₀k) (q/r²) 
=> E=(1/4πε₀k) (q/r²) -(ii)
Now for air or vacuum k=1 so equation becomes
E=(1/4πε₀) (q/r²)
Learn more about the electricfield intensity due to point charges.

Electric dipole:
[2.What is electric dipole?] A pair of equal and opposite point charge separated by very small distance is called an electric dipole

Here two equal and opposite charge -q and +q are placed 2a distance appoint running as electric dipole.

Electric dipole moment:
[3.What is electric dipole moment] The product of any of the charge of a dipole and the distance the charge is called the electric dipole moment. Its unit is coulomb’s meter. If q is a charge of the dipole and 2a is the distance then the magnitude of the dipole moment is p=qX2a.