Changes

===Formula===

'''Electric Field Strength''' is given by the general formula:

*<math>𝐸=\frac{𝐹}{𝑄}</math>

Where,

*𝐹 is the [[force]] experienced by a [[Electrical Charge|charge]] 'Q' in the field.

*𝑄 is the [[Electrical Charge|charge]] in that field.

The '''Electric field strength''' around a point [[Electrical Charge|charge]] is given by:

*<math>𝐸=𝑘\frac{𝑄}{𝑟^2}</math>

Where:

*𝑘 is the [[Coulomb's Constant|Coulomb's constant]]

*𝑄 is the [[Point Charge|point charge]] causing the field

*𝑟 is the distance from that [[Point Charge|point charge]]

Since;

*<math>𝑘=\frac{1}{4\pi\varepsilon_0}</math>

Then:

*<math>𝐸=\frac{1}{4\pi\varepsilon_0}\frac{𝑄}{𝑟^2}</math>

or

*<math>𝐸=\frac{𝑄}{4\pi\varepsilon_0𝑟^2}</math>

Where:

*<math>\varepsilon_0</math>is the [[Permittivity of Free Space|permittivity of free space]]