Field lines

[Abbas Raza]

1) how can we define the electric field lines...???

2) Reason for using point charge & stationary charge in Coulombs Law...???

3) How can we define "permittivity"...???

4) What is "Quantization Of Charge"...???

5) Area Vector...???

Reply to these Questions...???

[rktpro]

1) how can we define the electric field lines...???

2) Reason for using point charge & stationary charge in Coulombs Law...???

3) How can we define "permittivity"...???

4) What is "Quantization Of Charge"...???

5) Area Vector...???

Reply to these Questions...???

 

Field lines are lines along the direction of which the north pole of a magnetic needle would align itself.

I think, quantization means that the charge can only be exchanged in whole numbers.

Edited October 19, 2011 by rktpro

[Guest Rollin78]

I remember asking my professor why can field lines never cross each other????

AND I STILL REMEMBER THE GRIN, AND THE ANSWER OF COURSE The tangent at any point of line shows the direction of the magneticfield, if two lines cut each other there will be two directions of magneticfield, which is impossible.

 

and adding to this he also made a point, you are not gonna remember it....anyhow..!

[Klaynos]

1) how can we define the electric field lines...???

 

http://en.wikipedia.org/wiki/Field_line

 

Gives you quiet a nice definition in the first paragraph.

 

2) Reason for using point charge & stationary charge in Coulombs Law...???

 

Electrostatics is much easier than electrodynamics, you can of course work out what's going on for moving charges but you will find that the fundamentals from electrostatics become useful.

 

3) How can we define "permittivity"...???

 

Yes, it's how an electric field is affected by a medium. Normally it's dependent on the charge carriers in a material and their response to an electric field.

 

4) What is "Quantization Of Charge"...???

 

Charge only comes in set packets, which are well know, the smallest of which are quarks, you cannot get half a quarks amount of charge as far as we know. It is more normal to use an electron's charge as quarks are never observed free, so taking the charge of an electron (or the charge of a proton which is equal and opposite) is normally more sensible

 

5) Area Vector...???

 

Again I'd point you towards wp...

 

http://en.wikipedia.org/wiki/Vector_area

 

Nearly all of your questions here can be answered easily with a bit of reading.