Bound charge of a dielectric (or a capacitor)

Bound Charge of a Dielectric (or a Capacitor)
- Integrated Circuits and Materials -
- An Online Book -

Integrated Circuits and Materials http://www.globalsino.com/ICsAndMaterials/

Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix

=================================================================================

Suppose that the piece of the material is inside the space between the metal plates, Figure 4558a shows the surface charge of density σ_S and bound charge σ_b. This then causes the potential between the plates produced by the original charge Q on the plates to decrease to a smaller value.

surface charge of density σS and bound charge σb

Figure 4558a. Surface charge of density σ_S and bound charge σ_b: the bound charge σ_b and the free charge σ_S - σ_b. The free charge portion produces the electric Field F and the electric flux density of ε₀F, while the bound charge portion produces polarization P. + and - denote the free positive and negative charges, respectively, and surface charge of density σS and bound charge σb

and

denote the bound positive and negative charges, respectively. [1]

Figure 4558a shows the electrostatic induction with positively charged insulator A and uncharged conductor B (isolated).

surface charge of density σS and bound charge σb

Figure 4558a. The electrostatic induction with positively charged insulator A and uncharged conductor B (isolated). [1]

============================================

[1] Kwan Chi Kao, Dielectric Phenomena in Solids: With Emphasis on Physical Concepts of Electronic Processes, 2004.

=================================================================================