Electric Flux: Definition, Equation & Examples

AI Thread Summary
Electric flux is defined as the product of the electric field and the area, expressed as Φ = EA, because it quantifies the number of electric field lines passing perpendicularly through a surface. The equation reflects that electric flux is influenced by the strength of the electric field (E) and the size of the area (A) through which it passes. It is important to note that electric flux is not directly proportional to charge; rather, it can remain constant with varying distances from the charge. The formula also incorporates the angle between the electric field and the surface area, represented as cos(x). Understanding electric flux is crucial for analyzing electric fields and their interactions with surfaces.
ewr
Messages
4
Reaction score
0
Why is the electric flux defined as (electric field) x (area), Φ = EA? How do you come up with that equation? Is it because the electric flux is proportional to the charge and surface area?
 
Physics news on Phys.org
That's close, although it's not quite right to say that it's proportional to the charge; you can get the same amount of flux through a given surface with a small charge nearby or a larger charge farther away. That's why the field strength E appears in the formula.
 
Flux Is defined as the number of field Lines passing normally through a given area.
Hence ## dR = E.dS = Edscosx ##
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'
So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
Back
Top