A physics student wants to make a copper wire with an overall resistance of 0.750ohm. If...
One copper wire has a cross sectional area of A and resistance R and length L. A second copper wire has a length L and cross-sectional area 2A. What is the resistance of the second wire in terms of R? R/2 R 2R 4R Some other value
A copper wire of length L and cross-sectional area A has a resistance of R0. What is the resistance of another copper wire with length 6L and cross-sectional area 2A. Give your answer as a multiple of R0. A 18.00 R0 B 0.33 R0 C 6.00 R0 D 3.00 R0 E 1.50 R0
What is the resistance of a copper wire 1.2 m in length whose cross-sectional area is 3.0 x 10-6 m2 at 35oC?
Now let’s see how temperature affects the resistance of copper wire. A length of 18 gauge copper wire with a diameter of 1.02 mm and a cross-sectional area of 8.20×10−7 m2 has a resistance of 1.02 Ω at a temperature of 20 ∘C. Find the resistance at 0 ∘C and at 100 ∘C. The temperature coefficient of resistivity of copper is 0.0039 (C∘)−1. On a hot summer day in Death Valley, the resistance is 1.15 Ω. What is the temperature?
For a physics lab assignment, a student needs to create a solenoid using copper wire with diameter d = 0.500 mm. The resistance of the solenoid needs to be 3.10 Ω and the magnetic field of the solenoid with a current of 2.50 A should be 5.10 ✕ 10−2 T. Assume the resistance does not change significantly with temperature, and the radius of the solenoid is 1.00 cm. (Use ρ = 1.70 ✕ 10−8 Ω · m for the resistivity...
1. What is the resistance of a 450 m long copper wire that has a cross-sectional area of 3.00 x 10–6 m2?
A thick copper wire 2.3 m long is connected in series to a thin high-resistance Nichrome wire. In the steady state, the conventional current in the thick copper wire is 4 amperes. In this copper wire there are 8 � 1028 mobile electrons per cubic meter and the electron mobility is 4.5 � 10?3 (m/s)/(V/m). The cross-sectional area of the copper wire is 6 � 10?7 m2. The thin high-resistance Nichrome wire (which is connected in series to the thick...
A wire of length L and cross-sectional area A has a resistance of 5 Ω. What is the resistance if the same amount of material is used to make a wire triple as long?
You have a 100-m copper wire with cross-sectional area 0.25 mm2 and resistivity 1.7×10−8Ω⋅m. You make a 780-turn solenoid by winding the wire on a plastic tube (diameter 4.0 cm, length 10 cm). a) Determine the resistance of the solenoid. Express your answer with the appropriate units. b) Determine the inductance of the solenoid. Express your answer with the appropriate units. c) Determine the frequency of the alternating current at which the inductive reactance of the solenoid is equal to...
A long copper wire is used to transmit a current from one side of the campus to another as part of a scientific experiment to measure the speed of sound. The wire has a cross sectional area of 2.5*10^-6 m^2 and a total resistance of 7.2 ohms. A voltage of 25 V is applied across the length of the wire. The resistivity of copper is 1.68*10^-8 ohms m. How long is the wire? What is the current flowing through the...