A two level system has N1=6000 and N2=4000 when the temperature is 700K
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A two level system has N1=6000 and N2=4000 when the temperature is 700K.
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- mp?attempt=2176198&cmid%3D1088508page%3D6 Question 7 Not yet anwend Marked out of 10.00 Hlag question The line shown in the figure has a linear charge distribution of 101 nC/em. If R=8 cm, find the Electric Potential at the point indicated by the dot. Scan clearly your detailed answers and upload it in question 8. R. 2R V=224016.68 V V=134410.01 V V=448033.36 V V=672050.04 vConsider a metal with an electron density of n = 6.01 E28 m3.Calculate the Fermi energy of this metal. Enter the Fermi energy in "ev" units. Type your answer.3. A particle with a charge of 8nC is 4m away from a charge of 10C. What is the electric potential energy?
- 8. Liquids with solid impurities a) Have higher dielectrie 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 dc 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) 35Question 2: a. [PI-1.c] The following graph presents two curves corresponding to Fermi functions of a material at two different temperatures. Knowing that Ty is higher than T., specify which temperature correspond to which curve. Explain your answer. P 02 Curve 1 Curve 2 C4 0.5 The Fermi Function CA2. When a current of 1A flows through a wire, the drift velocity of the electrons is 0.9 mm/s. What will be the drift velocity of the electrons when a 2A current flows through another wire of the same material having double the length and double the area of cross section and same temperature.
- P1.15. A copper wire has a diameter of 2.05 mm and carries a current of 15 A due solely to clectrons. (These values are common in residential wiring.) Each electron has a charge of -1.60 × 10-19 C. Assume that the free-electron (these are the electrons capable of moving through the copper) concentration in copper is 1029 electrons/m'. Find the average velocity of the electrons in the wire.1.00 MQ A conducting sphere is charged by an emf source & through a 1.00 MN resistor. When the sphere is fully charged, it has 2 µC charge. The highest current during the charging was I mA. What is the electrical potential energy of the sphere when it is fully chargeď? Give your answer in mJ.ANS: 5) You use a voltmeter to measure potential difference from a very long wire carries a uniform linear charge density 2. The meter reads 450V when one probe of the meter is placed 4.5 cm from the wire and the other probe is 2.5 cm farther from the wire. What is 2? a) 9 x 107 C/m b) 9 x 10 C/m c) 2.5 x 10-7 C/m d) 2.5 x 10 C/m e) none of above ANS:
- 7. 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. [31-7%, 29-4%, 38-9%; 85-7%]2 Curront is definad as the rate of charge flow. It a charge offo.0065 Golombs passes a given point in a conductor in loo millisesands, Calcutate the? a) current in amperes (Hint: I=) b) Current in milli ampares- a.given Ans: a)o.065 A b) 65 mAQuestion 2: a. [Pl-1.c] The following graph presents two curves corresponding to Fermi functions of a material at two different temperatures. Knowing that T, is higher than T., specify which temperature correspond to which curve. Explain your answer. P 02 Curve 1 Curve 2 C4 The Fermi Function CA