# Difference between Electric flux density,electric field strength....

by sachin123
Tags: h-field, magnetic field stren
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 P: 121 I want to know the difference between,electric flux density and electric field strength.Are they the same? And also,there is a magnetic field(measured in Tesla),magnetic flux(in Weber),magnetic flux density(Weber per m2),magnetic field strength(measured in Tesla again?). I am finding these very confusing.Can someone clear this out? Thanks
 Sci Advisor HW Helper Thanks P: 26,148 hi sachin123! from the pf library on flux …In electromagnetism, flux always means total flow through a surface (a scalar), and is measured in webers (magnetic flux) or volt-metres (electric flux). Flux is the amount of a vector field going through a surface: it is the integral (over the surface) of the normal component of the fieldflux density (btw, this is density per area, not per volume) is the same as the field … flux = ∫ field "dot" area, so field = flux per area = flux density … tesla = weber/metre2 (and "strength" just means "amount" … you can leave it out when writing, and ignore it when reading )
 P: 121 I am clear with Electric field strength(=electric flux density) and electric flux. 1.)Does it mean that magnetic field strength=magnetic flux density? and... from what you said, magnetic field strength = magnetic field. But,here is what my book says: Magnetic field strength (H)=B/$$\mu$$ where B is magnetic flux density. Now weren't they supposed to be the same?(magnetic flux density and Magnetic field strength)
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P: 26,148
Difference between Electric flux density,electric field strength....

 Quote by sachin123 But,here is what my book says: Magnetic field strength (H)=B/$$\mu$$ where B is magnetic flux density. Now weren't they supposed to be the same?(magnetic flux density and Magnetic field strength)
ah, i see …

your book is calling H (in amps per metre) the magnetic field strength …

i haven't come across that before …

i've seen magnetic field intensity for H, but not strength

oh, in that case forget what i said about ignoring the word "strength": clearly some books are using it to distinguish H from B (in webers per metre squared)

(but the best way to distinguish them is to call them the H-field and the B-field )
 P: 121 So,to conclude it, magnetic flux is number of magnetic lines passing through surface area....... unit:weber magnetic flux density is number of magnetic lines passing through unit surface area....... unit:weber per (m square) magnetic field is same as magnetic flux density magnetic field strength =magnetic field intensity is H =B/(mu) unit:A per m Is it correct?
 P: 121 'mu' i meant as $$\mu$$

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