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Unformatted text preview: EMS 172 Profs. Y. Takamura and A. Moul, 2009 UNIVERSITY OF CALIFORNIA, DAVIS Department of Chemical Engineering and Materials Science EMS 172: Electronic, Magnetic, and Optical Properties of Materials Homework 7 Due Date: Tuesday, Nov. 24 th , 2009 in class Note: You must show all the steps you used to obtain your answer in order to receive full credit. 1. [10 pts] i) Because of its high dielectric strength, SF 6 gas is widely used as an insulator and a dielectric in high voltage (HV) applications such as HV transformers, switches, circuit breakers, transmission lines and HV capacitors. The SF 6 gas at 1 atm and at room temperature has a dielectric constant of 1.0015. The number of SF 6 molecules per unit volume can be calculated using the ideal gas law. Calculate the electronic polarizability ( e ) of the SF 6 molecule. ii) How does e compare with the e vs. Z line in Figure 7.4 of the Kasap chapter? Does it have a relatively high or low polarizability? (Note SF 6 has recently been found to be a greenhouse gas and is being phased out from...
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