The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the material of the wire is 50 × 10-8 ohm meter, find the length of the wire.
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The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the material of the wire is 50 × 10-8 ohm meter, find the length of the wire.
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- The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law :R = Ro [1 + α (T – To )]The resistance is 101.6 Ω at the triple-point of water 273.16 K, and 165.5 Ω at the normal melting point of lead (600.5 K). What is the temperature when the resistance is 123.4 Ω?A thin copper wire with a diameter 2.5 mm is connected to a 1.2-V potential difference, a current of 2.0 amps flows through the wire. The resistivity of copper is 1.72 × 10-8 Ω ∙ m. What is the length of the wire?A certain material has a resistance of 250 Q at 20°C. The material is then heated to 1500°C, calculate the new resistance. Given the temperature coefficient of resistivity of the material is 4.65x10.³ °C-¹.
- The resistivity of copper is 1.72E-8 Ω×m. What is the resistance of a copper wire that is 27.5 m long and has a diameter of 7.99E-3 m (in Ω)?What temperature should a copper wire (which is originally at 20°C) reach to increase its resistance by 12%? Information: alpha = 0.0068 (C^-1) Help: The final resistance of the copper wire is R = 1.12Ro Write your answer with 2 significant figures.Resistance depends on the size and shape of a conductor. We expect a long wire to have higher resistance than a short one (everything else being the same) and a thicker wire to have a lower resistance than a thin one. Resistance also depends on the intrinsic property of the conductor called the resistivity. If the resistivity of a particular wire is 70.26x10-8 Ω ⋅ m, the wire is 44.47mm in length, and the radius of the diameter of the wire is 1.95m, what is the resistance of the wire in units of Ohms (Ω)?
- A certain material is in a room at 25°C. If the absolute temperature (K) of the material is tripled, its resistance doubles. (Water freezes at 273 K.) What is the value for α, the temperature coefficient of resistivity?The resistivity of a 100 m long copper wire is 1.72 x 10-80m. If the cross sectional area of the wire is 6 x 10-6m2, what is its resistance? 0.30 30 30 300A heating element is a (nichrome) wire with cross-sectional area of 2 x 10^-7 m^2 and is 1.3 m long. The material has resistivity of 4 x 10^-5 ohm-m at 200°C and a temperature coefficient of 3 x 10^-2 /°C. Find the resistance of the element at 350°C.
- Calculate the cross-sectional area, in mm2, of a piece of copper wire, 40 m in length and having a resistance of 0.25 ohm. Take the resistivity of copper as 0.02 × 10−6 ohm.(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.A copper wire has a diameter of 0.430 mm. What length of the wire has a resistance of 3.00 0?