An 80 cm long wire is made by welding a 1.8 mm diameter, 20 cm long copper wire to a 1.8 mm diameter, 60 cm long iron wire at normal room temperature (20 ∘C).
When two wires are connected end to end, their resistances add together.
The resistivity of copper is 1.68×10−8Ωm and the of iron is 1.00×10−7Ωm. The temperature coefficients are: copper = 0.0039/∘C and iron = 0.0050/∘C.
What is the resistance of the iron section of wire?
An 80 cm long wire is made by welding a 1.8 mm diameter, 20 cm long...
An 80 cm long wire is made by welding a 1.8 mm diameter, 20 cm long copper wire to a 1.8 mm diameter, 60 cm long iron wire at normal room temperature (20 ∘C). When two wires are connected end to end, their resistances add together. The resistivity of copper is 1.68×10−8Ωm and the of iron is 1.00×10−7Ωm. The temperature coefficients are: copper = 0.0039/∘C and iron = 0.0050/∘C. What is the resistance of the copper section of wire?
A 2.0-m length of wire is made by welding the end of a 120-cm-long silver wire to the end of an 80-cm-long copper wire. Each piece of wire is 0.60 mm in diameter. The wire is at room temperature, so the resistivities are as given in Table 25.1. A potential difference of 9.0 V is maintained between the ends of the 2.0-m composite wire.
What is the resistance of a 2.9-m length of copper wire 1.8 mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m.
A solenoid 10 cm in diameter and 630 cm long is made from copper wire of diameter 0.050 cm, with very thin insulation. The wire is wound onto a cardboard tube to make a solenoid. (a) Determine the resistance in the wire. You may take the resistivity of copper to be 1.68 times 10^-8 Ohm m. (b) The number of turns in the wire is ten. Find the current necessary to produce a magnetic field of strength 1.5T. (c) How...
Calculate the ratio of the resistance of 12.0 m of aluminum wire 2.4 mm in diameter, to 26.0 m of copper wire 1.8 mm in diameter. The resistivity of copper is 1.68× 10 −8 Ω⋅m and the resistivity of aluminum is 2.65× 10 −8 Ω⋅m .
A cylindrical tungsten filament 15.0 cm long with a diameter of 1.10 mm is to be used in a machine for which the temperature will range from room temperature (20 ∘C) up to 120 ∘C. It will carry a current of 13.5 A at all temperatures ( Resistivity of tungsten at 20 ∘C is 5.25×10−8Ω⋅m , the temperature coefficient of resistivity at 20 ∘Cis 0.0045 ∘C−1 ) Part B What will be its resistance with that field? Express your answer...
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2. A 16.50 cm long wire has a diameter of 0.355 mm and a resistivity of 7.65 x 10-7 S2cm. (a) Calculate its resistance. (b) If a 3.85 volt battery is connected to the wire, w hat current exists in the circuit? (7 pts)
A wire 50.0 m long 려nd 2.00 mm in diameter is connected to a source with potential difference of 9.11 V, and the current is found to be 5.72 A. Assume a temperature of 20°C and using the table below, identify the metal out of which the wire is mad Resistivities and Temperature Coefficients of Resistivity for Various Materials (at 20°c) Material Resistivity Temperature Coefficient (Q m)of Resistivity (°c)-1 -3 1.59× 10 3.8 x 10 1.7 x 10-8 2.44 x...
A 16.50 cm long wire has a diameter of 0.355 mm and a resistivity of 7.65 x 10^(-7) cm a. Calculate its resistance (For part a. i've seen people multiply by 4 and some not which is the correct way to solve this?) b. If a 3.85 volt battery is connected to the wire, what current exists in the circuit?