Dielectric Dielectric Strength (kV/mm) Constant Material к Air (1 atm) 1.00054 3 Polystyrene Paper Transformer oil 2.6 24 3.5 16 4.5 Pyrex 4.7 14 Ruby mica 5.4 Porcelain 6.5 Silicon 12 Germanium 16 Ethanol 25 Water (20°C) 80.4 Water (25°C) 78.5 Titania ceramic 130 Strontium titanate 310 For a vacuum, K = unity.
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.
Given a 7.4 pF air-filled capacitor, you are asked to convert it to a capacitor that can store up to 7.85 μJ with a maximum potential difference of 672 V. What dielectric in the table above should you use to fill the gap in the air capacitor if you do not allow for a margin of error?
Multiple choice:
polystyrene
paper
pyrex
ruby mica
porcelain
silicon
germanium
titania
ceramic
strontium
titanate
(please show units in your calculations so that I can follow the work easier)
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