ECE106 Lecture 52: ECE 106,University of Waterloo,(p52)
6 Sep 2018
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C = q = a = sa = s0sra = s c. V s d d d r 0 (6. 34) Experimentally, one can observe that parallel plate whose capacitance is c0 = s0a/d in free space. Increases its capacitance to c = sa/d when a material of dielectric constant (or relative permittivity) sr fills the space between the plate. Since by definition, c = q/v , it follows that for the same charge q plates, between voltage plates, the the the on. We know that the electric field and the potential in the inter plate region. So we can write edia = evac/sr, i. e. the field intensity is reduced inside the dielectric. There is no free electrons in an ideal dielectric. In real life, lossy dielectric have some free electrons, but negligible compared to the number in conductors. In dielectrics, electrons are strongly bound to the parent atoms (material is electrically neutral). neutral state external electric field.
