1. Dielectric constant of wate:r (a) What is the (static) dielectric constant of

Question

1. Dielectric constant of wate:r (a) What is the (static) dielectric constant of a medium? Why does water have a large dielectric constant? (b) How does the dielectric constant of liquid water change with temperature? Explain why in two or three sentences. (You may find the first animation helpful in the following link: https://www.doitpoms.ac.uk/tlplib/dielectrics/temperature.php) (e) Is the interaction between anions and cations in water stronger or weaker compared to that in lipid membranes? Explain why in terms of the electrostatic potential energy

Explanation / Answer

A) Definition: The ratio of the capacitance of a given capacitor (with the material filling the entire space between its plates) to the capacitance of the same capacitor in vacuum is called static dielectric constant or relative permittivity of the material.

Water has a high dielectric constant due to strong bonds between hydrogen and oxygen as well as hydrogen bonding between water molecules. Water also doesn’t ionize so even though it has strong charges those charges are tightly bound to the molecule.

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