The lengths of two conductor wires made of different materials are L1-2L2 and The resistors are given as R1=2R2. The cross-sectional area of the first wire is 0.025 m2 and the second the cross-sectional area of the wire is 0.050 m²is. What is the resistivity ratio (r1/r2) of these two wires?
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- The voltage across a membrane forming a cell wall is 84 mV and the membrane is 7.5 nm thick. What is the electric field strength in the cell wall, in volts per meter?Three resistors are made out of three different materials and Material 1 0.00479 Q-m have different (but uniform) cross sections. Resistor 1 has a Material 2 0.391 Q-m circular cross section of radius 1.18 mm. Resistor 2 has a Material 3 6.87 x 10- 2.m square cross section with a side length of 1.37 mm. The third resistor's cross section is a right triangle with two sides of length 6.47 mm. All of the resistors are 0.838 cm in length. Use the provided table of resistivities to calculate the resistance 3 of each resistor. R1 R2 R3 =Consider the following circuit diagram. The potential difference across the battery is 40.0 volts, and it supplies a current of 5.00 amperes to the circuit. There is a current of of 2.70 amperes flowing through R1. Resistor R2 has a resistance of 5.50 ohms. What is the resistance of R3? Answer in ohms to two decimal places, but do not include units in your answer.
- 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 .N32.Copper has a density of 8.96 x 10³ kg/m³ and a resistivity of 1.70 × 1080.m. A. On the basis of the classical free-electron gas model, assuming that each Cu atom contributes one electron to the electron gas, calculate the average time between collisions of the electrons. B. Calculate the mean free path from the mean free time and the electron's thermal velocity. C. How does the mean free path compare with the spacing between atoms in the lattice of Cu?