ECE106 Lecture Notes - Lecture 53: Dielectric, Electric Field, Electric Dipole Moment

• School: University of Waterloo
• Department: Electrical and Computer Engineering
• Course: ECE106
• Professor: All

Document Summary

Net polarization = 0 net polarization 0 random molecular (ionic) orientation induced orientation polarization external electric field. In most dielectrics, when subjected to an external electric field, a combination of these polar- ization effects take place. Consider a block of dielectric subjected to an externally applied field, e0: Figure 6. 13: a block of dielectric in an external electric field/ In this case, while the electrons are not free, the atoms will still get polarized creating induced electric dipoles as shown in the above figure. Shift (stretch/orientation) in charge centers (polarization effects) causes a pick-up of induced surface charge (note: however these are bound charges and normally they cannot leave the dielectric mate- rial).