5. A certain material has diffusion coefficients Dn = 32 cm?/s and Dp = 10 cm²/s. The free electron concentration gradient, Vno, is three times the free hole concentration gradient, Vpo. The current density is J = 16 mA/cm². What are Vno and Vpo?
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- Each of three insulators forming a string has self-capacitance of "C" farad. The shunt capacitance of each cap of insulator is 0-25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency.It is required to grade a string having seven suspension insulators. If the pin to earth capacitance are all equal to C, determine the line to pin capacitance that would give the same voltage across each insulator (C1, C2, …….C6) of the string.a) Explain the band structure of an electrical conductor (metal), a semiconductor, and an insulator at 0 K by showing the valence and conduction bands and fermi energy levels. Explain how the electrical conduction takes place in these three types of materials. Give an example for each type of material. b)Explain what n and p-type semiconductors are using their band structures.
- 4. Define the continuity equation, then discuss the relaxation time in dielectric and conducting materials. Page 2 of 2The linear electron and hole concentration profiles in a 4 um wide region of silicon material is shown in the figure below. The silicon material is subjected to electron injection from the left and hole injection from the right as shown in the figure. Assume that the cross-sectional area of the material ?=1 ??2, electron mobility ??=1312.75 ??2/? ?, and hole mobility ??=463.33 ??2/? ?. Find the total current (to one decimal place) flowing through the material. ?=300?, ?=1.6×10−19 ?, ?=8.62×10−5 ??/?, ?=1.38×10−23 ?/?, and 1 ??=1.6×10−19 ?. Explain how depletion and diffusion capacitances differ4- Electrical failure of insulators occurs due to and 5- The other name of self-capacitance in a string of suspension insulators is ......
- 8. Each of the three insulators forming a string has a self capacitance of C farad The shunt capacitance of each insulator is 02C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement: )with the guard ring. (7) without guard ring. 10 95% () 86 13%|7. Each of three insulators forming a string has self-capacitance of "C farad. The shunt capacitance of each cap of msulator is 0 25 C to earth and 0-15 C to line. Calculate the voltage distribution across each insulator as a pecentage of line voltage to earth and the string efficiency.what must be the dis tance bebtween point charge 91=26.0 MC and point charge f2 = -47.0 MC for the electrostatic force between them to have amagnitude of 5.70N ? %3D
- 4. Hall effect measurements indicate that sometimes current is carried by positively charged particles. Can these particles be positively charged ions? Consider the cases of materials with high and low conductivities.8. Each of the three insulators forming a string has a self capacitance of C farad. The shunt capacitance of each insulator is 0-2 C to earth and 0-1 C to line. A guard-ring increases the capacitance of line of the metal work of the lowest insulator to 0-3 C. Calculate the string efficiency of the arrangement: (i) with the guard ring, (ii) without guard ring. [(i) 95% (ii) 86-13%)9.A semiconducting crystal with 12 mm long, 5 mm wide and 1 mm thick has a magnetic density of 0.5 Wbm-2 applied from front to back perpendicular to largest faces. current of 20 mA flows When a length wise through the specimen, measured across its width the voltage is found to be 37uV. What is the Hall coefficient of this semiconductor?