H. HA A coaxial capacitor with inner radius 5 mm, outer radius 6 mm and length 500 mm has a dielectric for which e, = 6.7 and an applied voltage 250 sin 377t (V). Determine the displacement current ip and compare with the conduction current i̟.
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- In the saturation region (I-V characteristics) of JFET the value of D18 ssmemanmnssnes at specific (VGS = * .negative voltage ) a. b.c.d a: constant O b: zero O c: maximum O d: Bothaandc OA student woants to identify the Resistivity of a conducting wire of unknown material. Resistivity is a property of a material that quantifies how strongly it conducts electric current, and it is formulated as, of p= R4 where R is the Resistance (ohms), A cross-sectional area (meters-squared) and I is the length (meters) of the wire. The student runs an experiment on a cylindrical wire of a length l of 2 centimeters and the cross- sectional area A of the wire is 6.1 centimeters-squared. The measurements of the Current is as below Dataset Voltage (Applied, Volts) Current (Measured, Amperes)Question 1 a) What is Hall Effect? Explain briefly. b) Show that the number density n of free electrons in a conductor wire is given in terms of the Hall electric field strength E, and the current density J, as n=JB/(eE). (Here we have J-i/A; i is the electric current intensity, and A is the cross-sectional area of the wire.) c) Calculate the voltage V sideway across the conductor given the following. The conductor wire has a square cross section of side d=150 µm. (Note 1 um= 10-6 m.) The magnetic field applied to the conductor has the strength B=0.60 Tesla. The current going through the conductor is i = 25 A. The density of free electrons in the conductor is n= 8.47 x 10²8 electrons/m³. Note further that we have by definition V=Ed.
- Two concentric metal spherical shells, of radius a and b, respectively, are separated by weakly conducting material of conductivity ơ (see part (a) of figure). (a) (b) a. If they are m aintained at a potenti al difference V, what current flows from one to the other? b. What is the resistan ce between the shells? c. Notice that if b > a the outer radius bis irrelevant. How do you account for that? Exploit this observation to determine the current flowing between two metal spheres, each of radius a, immer sed deep in the sea and held quite far apart (see part (b) of figure), if the potential difference between them is V. (This arr angement can be used to measure the conductivity of sea water.)Q6) The current density J= 4p ap µA/m2. find : 1) The total current crossing a cylinder surface bounded by: p=lm , 03 ¢s 2n, 0s2<2m 2) The currnet crossing a sheet z-5m. 3) If the volume charge density at p-im is pv-10nc/m find the charge velocity there.The following graph represents the charge-discharge profile of a Li-ion battery in the 1st and 50th cycles, cycled at a rate of 0.1 C (1C = 274 mA h g-1 ) in the voltage range of 3.0 to 4.6 V. The battery is made up of LiCoO2 cathode and Li anode. Answer the following questions. a. What is the value of charge-discharge current density in this case? How long does it take for this battery to discharge from 4.6 V to 3.0 V in 50th cycle? b. Calculate Coulombic efficiency at 1st and 50th cycles. Why are these values different? c. How would this graph look like if LiCoO2 and Li were replaced by MnO2 and graphite electrodes respectively Make a rough sketch. d. Mention any two practical disadvantages of this battery?
- 1. What is the conductance of device consisting of two concentric metal shells, the inner one having a radius of 20 cm, and the outer one having a radius of 40 cm, when the volume between the two shells is filled with tap water having a conductivity of 200 µS/m? (a) For al volt difference between the two shells, what is the electrical current? (b) What is the current density J at a radius slightly greater than 20 cm? What is the current density at a radius just shy of 40 cm?Silver has density 10.5 x 103kg/m3 and resistivity of 1.6 x 10-8 ohm.m at room temperature. a)what is the mean time between collision? b)what is the mean free path the electron thermal velocity?Question 1 a) What is Hall Effect? Explain briefly. b) Show that the number density n of free electrons in a conductor wire is given in terms of the Hall electric field strength E, and the current density J, as n=JB/(eE). (Here we have J=i/A; i is the electric current intensity, and A is the cross-sectional area of the wire.) c) Calculate the voltage V sideway across the conductor given the following. The conductor wire has a square cross section of side d=150 µm. (Note 1 um= 10-6 m.) The magnetic field applied to the conductor has the strength B= 0.60 Tesla. The current going through the conductor is i = 25 A. The density of free electrons in the conductor is n= 8.47 x 1028 electrons/m³. Note further that we have by definition V=Ed.
- Q4: For a Si conductor of length 5um doped n-type at 1015 cm-3. Calculate the current density for an applied voltage of 2.5v across its length Hn = 1500- cm-2 (Ans. 8.82 x 10-²A/cm?).mid 9634&page 3 A conductor has a cross-sectional area of 2.3x 10 m and the number of free electrons per unit volume is 8.5x 104 electron/m'. When the current is 10.2 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x 10 C. Select one: OA. 0.43 OB. 0.33 OC. 32.61 OD. 0.22 OE. 42.81 page Next page 9:03 P A OD A de ENG 4/30/20 nert 17 V Badapace Nom Sok Y 7 GYH K 4. 15 Enter BYN M 1 Shift End Eadthe current density present in a conductor is 570/m^2. what is the current flowing the conductor of the radius of cross sectional area is 0.34 ft