Dielectric Constant Of Water
Water constitutes about 70% of earth. Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.
Electrostatic Potential and Capacitance
An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particles. The electric force is the force which acts between two stationary charges. It is also called Coulomb force.
Consider a plane parallel-plate capacitor made of two strips of aluminum foil separated by a layer of paraffin-coated paper. Each strip of foil and paper is 4.40 cm wide. The foil is 0.00400 mm thick, and the paper is 0.0200 mm thick and has a dielectric constant of 3.70. What length should the strips be if a capacitance of 6.50 ✕ 10−8 F is desired? (If, after this plane capacitor is formed, a second paper strip can be added below the foil–paper–foil stack and the resulting assembly rolled into a cylindrical form—similar to that shown in the figure below—the capacitance can be doubled because both surfaces of each foil strip would then store charge. Without the second strip of paper, however, rolling the layers would result in a short circuit.)
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