Why does the ionic contribution to the dielectric constant vanish at frequencies

Question

Why does the ionic contribution to the dielectric constant vanish at frequencies greater than about 1GHz. a. The electrons cannot keep up with the oscillation of the electromagnetic wave polarity b. The polarons cannot keep up with the oscillation of the electromagnetic wave polarity c. The ions cannot keep up with the oscillation of the electromagnetic wave polarity d. The phonons maintain a rigid lattice response to the oscillation of the electromagnetic wave polarity e. c and d f. a and d What are three ways to increase the capacitance of a capacitor? a. Bring the electrodes closer together b. Reduce the area of electrodes by using carbon nanotubes and/or graphene c. Introduce a material that readily experiences ionic polarization under the application of an AC excitation d. Roll up the electrodes to form a multilayer cylinder e. a and d f. b and c g. a, c, and d

Explanation / Answer

11.) During Ionic Conduction, the Polarons.i,e., the ions are the constituents responsible for electrical conductivity along with the electrons and since they are the heavier as compared to electrons, their contribution to polarization and electrical conductivity reduces with increase in frequency of applied ac emf. This happens because the polarons or ions in the solution can't keep up with the oscillations of the polarity of the electromagnetic wave.

SO THE ANSWER IS (b.)

12.) Capacitance of a capacitor can be increased by either increasing the charge stored or reducing the potential difference between the electrodes. These can be achieved by the methods proposed in points (a), (c) and (d). Bringing the electrodes closer reduces potential difference between the electrodes. Introducing a material that readily experiences ionic polarization under the application of an AC excitation increases the amt. of charge stored in the electrodes. rolling up the plate electrodes to form multilayered coaxial cylinders scales up capacitance by inverse of the logarithm of the ratio of outer and inner radii of cylinders,thereby increasing charge storage capacity.

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