The resistivity of blood is related to its hematocrit, the volume fraction of red blood cells in the blood. A commonly used equation relating the hematocrit h the blood resistivity ρ (in Ω⋅m) is ρ=1.32/(1−h)−0.79. In one experiment, blood filled a graduated cylinder with an inner diameter of 0.90 cm. The resistance of the blood between the 1.0 cm and 2.0 cm marks of the cylinder was measured to be 210 Ω. What was the hematocrit for this blood?

Q: What is the resistance R of a 51.7-m-long aluminum wire that has a diameter of 8.63 mm? The…

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Q: You are working at a company that manufactures electrical wire. Gold is the most ductile of all…

A: resistance, R=ρlA where, ρ=resistivity of gold=2.44×10-8Ωm l=length of the wire A=surface area of…

Q: A 14-gauge copper wire has a cross-section area of 2.081 mm². The resistivity of copper at 20…

A: The initial (20oC) resistance is, R1=ρLA=1.7×10-8 Ωm100 m2.081 mm210-6 m21 mm2=0.817 Ω

Q: A teapot with a surface area of 715 cm is to be plated with silver. It is attached to the negative…

A: Surface area (A) = 715 cm2Potential difference of the battery (V) = 12 volts Resistance (R) = 1.5…

Q: Charges can move across the cell membrane, so it is not a perfect insulator; the cell membrane has a…

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Q: Gold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.15…

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Q: An engineering intern is studying the effect of temperature on the resistance of a current carrying…

A: Consider the first case,  initial temperature, T = 20 oC Final temperature, T1 = 54 oC Change in…

Q: Gold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.38…

A: The volume of a material is calculated by using the formula V=mρ , where m=0.001 kg is the mass and…

Q: As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a…

A: At T=20°, the resistance of the rod is given by R20=ρ20l20A

Q: A cylindrical aluminum pipe of length 1.41 m has an inner radius of 1.72 ×10-3 m and an outer radius…

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Q: A piece of Nichrome wire has a radius of 5.0x 104 m. It is used in a laboratory to make a heater…

A: Given, For a Nichrome wire the radius of the wire is a=5×10-4m Power dissipates is P=4×102W voltage…

Q: What is the resistance of a 21-cm-long column of blood in a 0.80-cm- diameter femoral artery? The…

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Q: A cylindrical aluminum pipe of length 1.42 m has an inner radius of 1.59 x103 m and an outer radius…

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Q: Nerve impulses are carried along axons, the elongated fibers that transmit neural signals. We can…

A: Given Diameter  = 10 μm Specific resistance ρ = 0.5 ohm. meter Length l = 7 mm To Find out…

Q: Aluminum has a resistivity of 2.65 × 10-8 2 × m. What is the resistance of 15 m of aluminum wire…

A: We have given        Resistivity (Rho) = 2.65 × 10-8 ohm_meter And.             Length (l) = 15 m…

Q: 6.6N and R 4.9n. The capacitor has a capacitance C-13.4 µF. The emf source, E, of the circuit shown…

A: R1 = 6.6 Ω R2 = 4.9 Ω C = 13.4 μF Q = 17.1 μC

Q: The resistivity of aluminum is 2.82 ✕ 10−8 Ω · m.   (a) Find the resistance of an aluminum wire (in…

A: Given: The resistivity of the aluminum is 2.82 ✕ 10−8 Ω · m. The radius of the wire is 1.32 mm. The…

Q: The resistivity of a 1.0 m long wire is 1.72 x 10-8pm and its cross sectional area is 2.0 X 10-6m2.…

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Q: copper wire is r = 2.19 cm in radius and 2.6 m in length, has a resistivity of 1.72x10^-8 Ω m, and…

A: Given: The radius of the wire is 2.19 cm. The length of the wire is 2.6 m. The resistivity of the…

Q: A piece of wire has resistance of 1.25 2. The wire is made of a material with resistivity 8.2x10-7…

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Q: The resistance of a copper wire is measured to be 3.80 Ω at 21.6°C. What is the resistance of this…

A: Write down all the given parameters and formula

Q: In a discharge tube, the number of hydrogen ions 18 (i.e., protons) drifting across a cross-section…

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Q: Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.2 um x 1.2 um in area. A…

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Q: Suppose that the resistance between the walls of a biological cell is 5.9 × 109 Ω. (a) What is the…

A: Given that:- Resistance between the walls of a biological cell=5.9×10^9 ohm

Q: As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a…

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Q: Two conductors are made of the same material and have the same length. Conductor A is a solid wire…

A: RA=pLπrA2RB=pLπr22-r12

Q: A student finds two ancient meters with numbered scales but no unit markings. He thinks that one is…

A: according to Ohm's law, we can say that V=IR the voltmeter always has higher resistance than the…

Q: What is the resistance of a 3.4-mm length of copper wire 1.3 mm in diameter? The resistivity of…

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Q: 3.0 A battery has an emf of 12 V and an internal resistance of 0.0500 2. What is the terminal…

A: Given : Emf (E) = 12 V Resistance (R) = 0.0500 Ω Current (I) = 8 A

Q: What current flows through a 2.15 cm diameter rod of pure silicon that is 20.5 cm long, when 1000 V…

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Q: Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.8 pm x 1.8 pm in area. A…

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Q: As part of a class project you are given 0.900 g of copper and asked to fabricate a wire with…

A: Given,  Mass, m=0.9g Resistance, R=0.803Ω Resistivity, ρ=1.72×10-8Ωm Density, d=8.92×103kg/m3 Used…

Q: Two wires with the same resistance have the same diameter but different lengths. If wire 1 has…

A: Given Information:- Resistance and diameter of the two wires are same. Resistivity of copper is…

Q: A length of 120 cm from Aluminum cylinder with a cross-sectional area of 2.82 x 10 m2, the…

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Q: Gold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.35…

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Q: Two identical resistors of R0=32 omega are connected head to tail. Part (a) Express the resistance…

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Q: A copper wire has a length of 38.0 m and a resistance of 4.10 Q at 20.0°C. Assuming a circular…

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Q: What is the resistance of a 7.4-m length of copper wire 1.2 mm in diameter? The resistivity of…

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Q: A wire is made of a material with a resis- tivity of 2.97138 x 10-8 2 · m. It has length 2.16443 m…

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Q: Suppose that the resistance between the walls of a biological cell is 5.7 × 109 Ω. (a) What is the…

A: The difference between two points is known as the potential difference. Any sort of potential is…

Q: A coaxial cable of consists of two concentric cylindrical conductors. The region between the…

A: Given:- A coaxial cable consists of two concentric cylindrical conductors.   The radius of the inner…

Q: A platinum resistance thermometer (PRT) is a transducer which measures temperature 0 by means of…

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Q: Cell membranes contain channels that allow K+ ions to leak out. Consider a channel that has a…

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Q: A copper wire of radius a = 0.172 mm has an aluminum jacket of outer radius b = 0.231 mm. There is a…

A: Given: Radius of Copper,RC=0.172mm=0.172×10-3mOuter Radius of…

Q: The resistivity of aluminum is 2.82 × 10 -8 n. m. HINT (a) Find the resistance of an aluminum wire…

A: Given data: Resistivity, ρ=2.82×10-8Ω.m Radius of wire, r=1.28 mm=1.28×10-3m Length of wire, l=1.03…

Q: Figure a shows a rod of resistive material. The resistance per unit length of the rod increases in…

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Q: Nichrome is an alloy used for making electric heater wires. A nichrome wire of diameter 0.50 mm is o…

A: Current electricity.

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.