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- 1. Calculate the potential due to a dipole as shown in the figure at positions A and B in millivolts. 2. What would be the potential at Bif the distance from the dipole center to B is doubled,. 3. What would be the potential at A if the intensity of the current source is doubled. +2mA B =12em F 10mm 20 degree 90 degree r95 cm A. Resistivity = 75 Ohm-cm -2mA DipoleConduc-Thor-s. Thor has two square prism conductors that are made of the same ohmic material and with properties indicated below. Conductor Length | Cross-Section Side Length Alpha L Beta L/2 s/4 Suppose both conductors are subject to the same potential difference AV across their length while keeping their temperatures fixed. Which of the following is the correct relation between the electric currents, Ia and IB, through Alpha and Beta? O A. Ia = 8IB O B. 8Ia = Ig O. Ia = 4I8 O D. 4Ig = Ig Clear my choicemid 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 Ead
- Q2) If the electron concentration increase along the x-axis of a conductor as shown in equation below: n=1028+5x1030x+4x1033x2 And the electron diffusion constant is 1.2×10*m²/s. Find the diffusion current density at x = 5mm. (3 marks)What does the term fibrillation mean in connection with heart function? Give two important causes of heart fibrillation in human beings. How do pacemakers and defibrillators help to prolong life for patients suffering from this condition?Q1 /A piece of metal is its length 5m and its cross-sectional area 0.5 mm^2 and the specific resistance of the metal is 81.6*10^6 Q– m Note that the density of The substance is 8.96 kg/m^3 and the atomic weight 63.54 calculate: 1) Calculate the motion of the electron (H). 2) Calculate the mean free time (7). 3) If you know that the density of electrons along the x-coordinate increases according to the relationship n = 1030 + 8 * 1033x + 15 * 1036 x2 The temperature is 290k, so what is the value of the diffusion current Id at the metal surface x=0 3) If the value of the propagation current is Id at the distance x From the surface of the metal are 91.2*10^10 A/m2 What is the value of x
- Q2) a) Prove that IdL =dQ*V, where V: is the velocity! b) In a material er-3, the electric flux density D-0.31 c/m² and the conduction current density is 10 A/m², find the frequency if o-2 mS/m? O A7. The nominal resistance value of the a 4-band resistor is 470 k2 ± 5%. a. What is the resistance range of the resistor? b. What is the arrangement of the band colors?Which of these are TRUE: 1. Benjamin Franklin interpreted the negative terminal as an area where it lacks electrons 2. Resistivity is measured in ohms. 3. At high temperature, the vibrations of the atoms of the conductor increases 4. A conductor has electric current with or without potential difference 5. Only electron flow is acceptable in interpreting current flow
- 3. For a Si bar of length 5um, doped n-type at 3x10¹ cm³, calculate the current density for an applied field of 3V across its length. Then do the same for a voltage of 3200V. You can assume that the electron and hole mobilities are 1500 and 500 cm²/V.s, respectively, in the ohmic region below 10¹V/cm and. For higher fields, both electrons and holes have a saturation velocity of 107cm/s.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 u, = 1500 cm-2 (Ans. 8.82 x 10-2A/cm?).QUESTION 2 A cylindrical nickel wire of radius 2.0 mm and length 1.6 m has a potential difference of 12 volts applied between its ends. If the wire carries a resistive load of 4.0 Q, what is the drift velocity of the conduction electrons in the wire? Assume that the number density of conduction electrons in the wire is 9.12 x 1028 conduction electrons/m3. a. 0.0060 mm/s b. 0.036 mm/s C. 0.046 mm/s d. 0.016 mm/s e. 0.026 mm/s