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The specimen is taken in the form of disc in Lee's disc method to find the thermal
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- Electronics Physics -HW2 QI. In a P-type germanium, ni = 2×10" electrons/m and the density of boron 4x1023 atoms/m'. The electrons and holes mobility are (0.4 and 0.2 m/ V. s) respectively. What is its conductivity before and after addition of boron atoms? Note: For after addition of boron atoms you need to compare the actual and approximate conductivity ملاحظة: بعد اضافة ذرات البورون يكون حساب التوصيليه بالاستخدام التقريب وبدون استخدام التقريب والمقارنة بين النتائجTwo new materials have been discovered. One is shinyand has a metallic look, while the other is dull andhas a non-metallic look. Although you think that oneis a conductor and the other an insulator, you wantto be certain. Describe a test you could do to test theconductivity of these two materials.The molar conductivity of Na1 ions in aqueous solution at 25°C has been determined to be =.01 × 10-2 (V cm)-1 mol-1L. Assume an electric field of 1.0 × 102 V cm-1 is applied to the solution. Calculate the mobility and the drift velocity of Na1 ions.
- A solid conduetor of eireular eross-setion with a radius of 5 mm has a conductivity that varies with radins. The conductor is 20 m long and there is a potentinl difference of 0.1 V de between its two ends. Within the conductor, II –- 10°p²a, A/m. Find J as a funetion of g6.31 A spherical shell has inner and outer radii a and b, respectively. Assume that the shell has a uniform conductivity o and that it has copper electrodes plated on the inner and outer surfaces. Show that %3D 477O aA Cu wire of diameter of 2 mm and length of 1 m initially at room temperature of 300 K is applied a constant voltage difference of 100 V for 1000 seconds. The temperature of the wire rose due to Joule heating during the application of the voltage, so one waited for a sufficiently long time after the voltage is removed for the wire to cool back to the room temperature of 300 K. The conductivity of Cu is 6×107S/m. Please answer the following questions, assuming the surroundings is at room temperature 300 K: (a) What is the internal energy change for the wire from the very initial state to the final state after the entire process ends? (b) What is the internal energy change for the surroundings for the entire process? (c) What is the amount of heat that was generated in the wire and transferred to the surroundings during the entire process? (d) What is the total internal energy change of the wire plus the surroundings during the entire process? (e) What is the entropy change for the wire…
- Is it feasible to describe the distinction between a conductor and an insulator using a semiconductor as an example? Why not use a graph to explain the arguments you're making?In a normal conductor heat is generated at a rate I 2R. Therefore a current-carrying conductor must dissipate heat effectively or it can melt or overheat the device in which it is used. Consider a long cylindrical copper wire (resistivity 1.72x 10-8 Ω*m) of diameter 0.75 mm. If the wire can dissipate 80 W/m2 along its surface, what is the maximum current this wire can carry?A CONDUCTING WIRE OF CROSS-SECTION 0.1 MM^2 CARRIES A CURRENT OF 5A PRODUCED BY AN ELECTRIC FIELD AT 100 V/M.THE CONDUCTIVITY OF THE MATERIAL Is
- (c) Aluminium is a good conductor of electricity. A 100 m aluminium wire of diameter 2.25 mm is to be used in domestic electrical wiring. If a voltage of 250V and a current of 13 amps are needed, answer the following i. What is the conductivity of the aluminium wire? ii. Give two reasons why aluminium wire is not used in domestic wiring in Zambia? iii. Give three applications of pure aluminium.A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity o, with a potential difference dVbetween opposite faces. (a) Show that the current I= dq| dt is given by the equation on the left: Charge conduction Thermal conduction da = GA dt dQ = kA dx dt dx In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/ dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/ dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of energy…Using hand-drawn schematic diagrams, show curves that illustrate the temperature dependence of the electrical resistivity for the following types of materials: metals, semiconductors, and superconductors. Carefully diagram each curve, and labelling the plot axes.