arallel-plate capacitor has circular plates of diameter d, separated by distance x. There is no dielectric between the plates. If you want to make a second capacitor plate separation x/2, with no dielectric, but having the same capacitance as the first, what should the diameter of the plates be?

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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.