Engineering Electromagnetics
Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 6, Problem 6.3P

Capacitors tend to be more expensive as their capacitance and maximum voltage V max increase. The voltage V max is limited by the field strength at which the dielectric breaks down, Ebd- Which of these dielectrics will give the largest CVmax product for equal plate areas? (a) Air: đ�œ–y = 1, Ebd = 3 MV/m. (b) Barium titanate: e? = 1200, EBD = 3 MV/m. (c) Silicon dioxide: đ�œ–r = 3.78, EBD = 16 MV/m. (d) Polyethylene: đ�œ–T = 2.26, EBD = 4.7 MV/m.

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Each of the conductor in a parallel-plate capacitor is calleda. dielectricb. insulatorc. platesd. terminal
.i. In a parallel plate capacitor, the cross sectional area of the plates are doubled and all other parameters remains the same. The ratio of Final capacitance to initial capacitance is found to be:
8. Liquids with solid impurities a) Have higher dielectric strength b) Of large size have higher dielectric strength c) Have lower dielectric strength as compared to pure liquids d) None of the above 9. Peak to peak ripple is defined as a) the difference between average de voltage and peak value b) the difference between maximum and minimum de voltage c) the difference between maximum ac and average de voltages d) the difference between ac (rms) and average de voltages 10. In a Cockroft-Walton circuit, input voltage 100 kV load current 25 mA, supply frequency 100 Hz, each capacitor 10 nF. The optimum no. of stages for maximum output voltage is a) 1 b) 2 c) 10 d) 35

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