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Electric or magnetic field at point P in presence of dielectric/magnetic material. 
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#1
Nov1610, 07:39 PM

P: 3,883

I want to confirm either the electric field at a point P in space in an [itex]\vec E_{ext} [/itex] field with the presence of a dielectric material is the sum of the [itex]\vec E_{ext} [/itex] and electric field [itex]\vec E_{p} [/itex] from the dielectric material due to polarization cause by the [itex]\vec E_{ext} [/itex].
And this is also true of the magnetic field at a point P in space with [itex]\vec B_{ext} [/itex] and magnetic material. Thanks 


#2
Nov1710, 01:02 AM

P: 2,258

whats your question?



#3
Nov1710, 02:22 AM

P: 3,883




#4
Nov1710, 02:29 AM

P: 2,258

Electric or magnetic field at point P in presence of dielectric/magnetic material.



#5
Nov1710, 02:36 AM

Sci Advisor
P: 3,563

Yes, yungman, that's true, at least for the electric field and/ or in magnetostatics. In full electrodynamics, there is also a contribution of the change of P to the magnetic field. In fact, in optics one sets often M=0, so that all effects of the medium are due to P alone.



#6
Nov1710, 11:30 AM

P: 3,883

Same as in the case of magnetic with a piece of magnetic material close by. 


#7
Nov1810, 11:27 AM

P: 3,883

Do you mean if P is at some conducting material where very small free current density [itex]\vec J_{free}[/itex] created by even static magnetic field. But if P is just a point in space ( empty space) there should be no more changes. 


#8
Nov1810, 10:05 PM

Sci Advisor
HW Helper
PF Gold
P: 1,991




#9
Nov1910, 01:49 AM

Sci Advisor
P: 3,563




#10
Nov1910, 11:19 AM

P: 3,883

Anyway, thanks for all the replies to confirm my understanding. Alan 


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