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.
The figure shows an ideal cylindrical capacitor (L >> a, b) consisting of two cylindrical shells of length L with radius a and b. Cylinders have + Q and –Q charges, and the space between the two cylinders is filled with an inhomogeneous dielectric material given by the expression K= (1 + r / b) with the dielectric constant, a≤r≤b.
a-) Find the capacitance of the capacitor.
b-) Find the energy stored in the capacitor.
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