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.
Storm clouds build up large negative charges. The charges dwell in charge centers, regions of concentrated charge. Suppose a cloud has -25 C in a 1.0@km@diameter spherical charge center located 10 km above the ground, as sketched is shown. The negative charge center attracts a similar amount of positive charge that is spread on the ground below the cloud.
The charge center and the ground function as a charged capacitor, with a
potential difference of approximately 4 x 108 V. The large electric field between these two “electrodes” may ionize the air, leading to a
What is the approximate capacitance of the charge center + ground system?
A. 6 x 10-8 F B. 2 x 107 F C. 4 x 106 F D. 8 x 106 F
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