3. For a thin film sample under a square 4-point probe measurement, if the sheet resistance Rs 10.0 / and the resistivity of the Al film material is 2.8x10-10 cm, what is the thickness of the film?
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- 4. The resistance of a resistor changes with temperature; the equation is given as: R= a T^2 + b T+C. The resistance was measured at three different temperatures. (20 C, 521 ohms), (60 C, 1329 ohms), (100 C, 2925 ohms). What are the values of a, b, and c for this resistor? ( hint: create three equations, solve for the unknowns aband c using simultaneous equations.An iron wire has a length of 1.50 m and a cross sectional area of 0.240 mm2. If the resistivity of iron is 10.0 x 10-8 0· m and a potential difference of 0.800 V is maintained across its length, determine the current in the wire (in A). 3.6e-2 Can you use Ohm's law to express the current in the wire in terms of the resistance of the wire and the potential difference across the length of the wire? How is the resistance of the wire related to its resistivity, length, and cross-sectional area? A1. 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 Dipole
- 4. Calculate the number of ion pairs produced by an electron with kinetic energy of 1.0 MeV passing through a 30 mm thick ionization chamber. What is the total charge of electrons? If a hundred such particles pass through the chamber each second and all the ions are collected at the electrodes what is the total current? (The density of the gas is 1.3 kg/m³, the mass stopping power for air for 1.0 MeV is 1.67 MeV/(g/cm2) and it takes about 34 eV to produce an ion pair in air).A copper wire has a square cross section 2.3mm on a side. The wire is 4m long and carries a current of 3.6 A. The density of the free electrons is n = 8.5 * 1029 m-3. The resistivity of Copper is 1.7 * 10-8 ohmmeter. What is the current density and the electric field inside the wire?Silver at room temperature is found to have a resistivity of 1.59×108 №∙m. If the temperature is increased to 150°C what will be the resistivity of the silver?
- p5Q.4. Explain why an ammeter must be connected in series with a resistor while performing the KCL experiment.An object moves on xy plane according to the equation 7 = 20 cos(3t) î + (1,5t + 3,5t2)j. Determine its position at t = 0. Find its average velocity and average acceleration between t = 2s and t = 5s.
- 8. A heating element using nichrome connected to a 230 V supply draws an initial current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What is the steady temperature of the heating element if the room temperature is 27.0°C? Temperature coefficient of resistance of nichrome averaged over the temperature range involved is 1.70× 10 °C-1. -42) Resistivity is a property of a particular material and can be used to calculate the resistance of a sample. a) Provide an equation for calculating the resistivity of a material. b) Calculate the resistance of 50m roll of copper wire which has a cross sectional area of 5mm^2 if the resistivity of copper is 1.72 x 10^-8 ohm metres.A 46.0-g sample of a conducting material is all that is available. The resistivity of the material is measured to be 13 x 10-8 - m, and the density is 7.51 g/cm³. The material is to be shaped into a solid cylindrical wire that has a total resistance of 1.5 2. (a) What length of wire is required? m (b) What must be the diameter of the wire? mm Submit Answer