A fuel gauge uses a capacitor to determine the height of the fuel in a tank. The effective dielectric constant K changes from a value of 1 when the tank is empty, to a value of 7 ,when the tank is full. The appropriate electronic circuitry can determine the effective dielectric constant of the combined air and fuel between the capacitor plates. The dimension of the fuel tank is width w=19cm, length L=12cm and breadth d=18cm. The height of the fuel between the plates is h=7cm. A battery with e.m.f of 13v is connected across the plates. For gasoline, dielectric constant Kg. You can ignore any fringing effects. a) What is the capacitance, when 0.5 fraction of the fuel tank is filled by the gasoline b) What is the capacitance, when the fuel tank is totally filled by the gasoline?

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Water constitutes about 70% of earth.  Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.

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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.