A certain wire of radius 1-10 mm is made from an unknown alloy that has a resistivity of 1.25e-07 0m. What would be the length of this wire to have a resistance of 100 ? L= Submit Answer m
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- (a) What is the resistivity of the wire? (b) What material is the wire made of? You will have to look up the various resistivities.2. Page > of 3 5. Two long coaxial metal cylinders with radii a and b are separated by material of conductivity o (see figure below). The conductivity is not uniform and changes as = (s)0 where k is a constant. If the two cylinders are kept at a potential difference V, find the resistance R between the cylinders. (s)o Hint: Since the conductivity is a function of position, the charge density in the resistive medium is not zero and E does not go like 1/s. However, since the current I is steady, the same current flows across each eylindrical surface. Instead of using Gauss' Law, find E in terms of I, from Ohm's Law. acer F10 F11A copper wire has a diameter of 0.430 mm. What length of the wire has a resistance of 3.00 0?
- Problem 3: A 1.2 g wire has a density of 2.7 g/cm3 and a resistivity of 2.7 × 10−8 Ωm. The wire has a resistance of 15 Ω. a) How long is the wire? b) The wire is made up of atoms with valence 1 and molar mass 26.98 g/mol. What is the drift speed of the electrons when there is a voltage drop of 30 V across the wire?The resistivity of a material used to make a round 950W resistor is 53W per unit length. If the resistor has a radius of 0.16 in, what is it’s length?What is the resistance (in Ohms) of a wire made of a material with a resistivity of 3.3x 10-82. m if its length is 4 m and its diameter is 0.64 mm?
- The resistance R of a conductor depends on its shape and physical dimensions and a property of the material called the resistivity p What does the resistivity of a material depend upon? Assuming that the resistivity of copper is a quarter of that of aluminium and that the density of copper is three times that of aluminimium, find the ratio of the masses of copper and aluminium wires with the same length and the same resistance but with different cross - sectional areas .A conductor has a cross-sectional area of 2.3x10-6 m2 and the number of free electrons per unit volume is 8.5 x1028 electron/m³. When the current is 6.2 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6×10-19 c. Select one: А. 0.20 B. 0.14 C. 0.26 D. 26.02 Е. 19.82A heating element is made by maintaining a potential difference of 75.0 V across the length of a Nichrome wire has a 2.60 x 10-6 m² cross section. Nichrome has a resistiv of 5.00 x 10-7 m. If the element dissipates 5000 W, wha its length? Give your answer in cm.