# Electric Field Strength

brief notes

- Created by: Vithuja
- Created on: 20-09-11 11:11

First 169 words of the document:

Electric Field Strength

A gravity field is where a force is exerted on a mass; an electric field is a region

where a force is exerted on a charge.

The electric field strengthis defined as force per unit charge. In equation form

this is represented as:

E = F/Q

[E electric field strength; F force; Q charge]

E is a vector quantity and its units are newtons per coulomb, N/C. It can be

negative (attractive) or positive (repulsive).

Since the electric field strength is defined as force per unit charge, we can write:

This equation is true for all point charges, which can be considered to have a

radial field. A spherical charge can also be considered to have a radial field

provided the distance from the charge to the centre is much greater than the

radius of the sphere.

We can plot a graph of electric field strength against distance:

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