Dielectrics in Static Electric Field
Dielectrics in Static Electric Field
No free charge in dielectrics to make interior charge density and electric field vanish
Dielectrics contain bound charge Æ effect on the electric field
E-field Æ small disppplacement of positive and neg gg(ative charges (bound charge) Æ polarize a dielectric material
¾ a. Polar molecules : permanent dipole moments -30 ex) H2O (two or more dissimilar atoms) Æ P ~ 10 (C·m) )Individual dipoles are randomly oriented Æ macroscopically no net dipole )Some have a permanent dipole moment even in the absence of external field Æ electrets
¾ b. nonpolar molecules : no permanent dipole moments
Radio Technology Laboratory 1 Equivalent Charge Distribution of Polarized Dielectrics