A parallel-plate capacitor in air has a plate separation of 1.42 cm and a plate area of 25.0 cm2. The plates are charged to a potential difference of 265 V and disconnected from the source. The capacitor is then immersed in distilled water. Assume the liquid is an insulator. (a) Determine the charge on the plates before and after immersion. before pC after pC (b) Determine the capacitance and potential difference after immersion. Cf = F ΔVf = V (c) Determine the change in energy of the capacitor.nJ
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.
A parallel-plate capacitor in air has a plate separation of 1.42 cm and a plate area of 25.0 cm2. The plates are charged to a potential difference of 265 V and disconnected from the source. The capacitor is then immersed in distilled water. Assume the liquid is an insulator.
| before | pC |
| after | pC |
(b) Determine the capacitance and potential difference after immersion.
| Cf | = F |
| ΔVf | = V |
(c) Determine the change in energy of the capacitor.
nJ
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