# How does one define an electric field?

1. Jul 16, 2009

### ashutosha

How does one define an electric field??

How does one define an electric field??

2. Jul 16, 2009

### ZapperZ

Staff Emeritus
Re: Electricity

Via the Maxwell Equations.

Zz.

3. Jul 16, 2009

### ashutosha

Re: Electricity

What are the maxwell equations??

4. Jul 20, 2009

### hover

Re: Electricity

I think the simplest way to define an electric field is mathematically. That equation is E=kQ/r^2

E is electric field in Newtons per coulomb
k is the coulombs constant which is 9E9 (the units are Nm^2/C^2)
Q is the present charge in C
r is the distance away from the charge in meters

That's the simplest way to define an electric field I think.

The other way to define an electric field is by using this equation

F/q=E

F is the force between 2 electric particles in newtons
q is the charge measured in coulombs

hope this helps

5. Jul 21, 2009

### mikelepore

Re: Electricity

The force per unit charge that a positive charge would experience if it were to be inserted into a region of space, where the force is caused by the existence of one or more other charges.

Hover said: E=kQ/r^2
But it wasn't part of the question to assume that the field is caused by one point charge. For example, between two charged parallel plates the electric field is close to being a set of parallel lines with constant magnitude.

Last edited: Jul 21, 2009
6. Jul 22, 2009

### dE_logics

Re: Electricity

Checkout the attached PDF...those are the parts of my notes.

#### Attached Files:

• ###### Electrostatics (with understanding for Electric fields).pdf
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7. Jul 22, 2009

### nooma

Re: Electricity

An electric field is an area of space where something experiences a force due to its charge

8. Jul 22, 2009

### Born2bwire

Re: Electricity

True, but the same can be said about a magnetic field too in the case of moving charges.

9. Jul 22, 2009

### nooma

Re: Electricity

This may be true, but that is the formal definiton of an electric field