CheckPure water has very few ions (about 1.20 x 1014 ions per cubic centimeter), giving it a high resistivity, about 1.0 x 10 Q-m at 37.0°C.Blood plasma has a much lower resistivity of roughly 0.600 Q-m at 37.0°C due to the ions dissolved in the plasma. Assuming theresistivity depends only on the concentration of ions, how many ions per cubic centimeter are in blood plasma?1019 ions/cm3Ces< Prev8 of 10Next >acer

Resistivity is a property of a substance that determines how bad it is at conducting electricity.…

Answered: Pure water has very few ions (about…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 63P

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An aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps, (a) What is the absolute value of the charge density in the wire? (b) What is the drift velocity of the electrons? (c) What would be the drift velocity if the same gauge copper were used instead of aluminum? The density of copper is 8.96 g/cm3 and thedensity of aluminum is 2.70 g/cm3. The molar mass ofaluminum is 26.98 g/mol and the molar mass of copper is 63.5 g/mol. Assume each atom of metal contributes one free electron.
Taking R = 1.00 k and = 250 V in Figure P21.49, determine the direction and magnitude of the current in the horizontal wire between a and e. Figure P21.49
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?
An aluminum wire has a length of 27.0 m and a resistance of 4.30 Q at 20.0°C. Assuming a circular cross-section, what is the wire's diameter (in mm)? The resistivity of aluminum at 20.0°C is 2.82 x 10-80 m. mm
A copper wire of radius a = 0.256 mm has an aluminum jacket of outer radius b = 0.337 mm. There is a current i = 1.59 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 × 10-8Ω·m and 2.75 × 10-8Ω·m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V = 15.0 V between the ends maintains the current, what is the length in meters of the composite wire?
A copper wire of radius a = 0.172 mm has an aluminum jacket of outer radius b = 0.231 mm. There is a current i = 1.58A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 × 10-Q-m and 2.75 × 10*°Q-m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V = 10.4 V between the ends maintains the current, what is the length in meters of the composite wire? (a) Number i Units (b) Number i Units (c) Number i Units
A copper wire of radius a = 0.330 mm has an aluminum jacket of outer radius b = 0.476 mm. There is a current i = 1.50 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 x 1080-m and 2.75 x 1080-m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V = 18.0 V between the ends maintains the current, what is the length in meters of the composite wire? (a) Number i (b) Number (c) Number i Units Units Units
Aluminum has a resistivity of 2.65 × 10-8 Q × m. What is the resistance of 15 m of aluminum wire with cross-sectional area 1.0 mm2? O 1.3 x 102 2 1.6 Q 0.40 Q 56 Q O 0.13 Q
A copper wire of radius a = 0.161 mm has an aluminum jacket of outer radius b = 0.224 mm. There is a current i = 2.80 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 x 10Q-m and 2.75 x 10 Q-m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V = 17.3 V between the ends maintains the current, what is the length in meters of the composite wire? (a) Number Units (b) Number Units (c) Number Units
A 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 carries a current of 3.23 A. The wire has a charge carrier density of 8.49x10^28 electrons/m3. What is the electric potential difference, V in volts, across the wire? Note: Express your answer to three significant figures. Use scientific notation
An engineering intern is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a aluminum wire at a temperature of 59.0°C and notes that it produces a current of 1.40 A. If she then applies the same voltage to the same wire at -88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for aluminum is 3.90 x 10−³ (°C)-¹. (Assume that the reference temperature is 20°C.) A
Earth's lower atmosphere contains negative and positive ions that are produced by radioactive elements in the soil and cosmic rays from space. In a certain region, the atmospheric electric field strength is 174 V/m and the field is directed vertically down. This field causes singly charged positive ions, at a density of 868 cm³, to drift downward and singly charged negative ions, at a density of 624 cm3, to drift upward (see the figure). The measured conductivity of the air in that region is 3.45 x 10-14 (0-m)-¹. Calculate (a) the magnitude of the current density and (b) the ion drift speed, assumed to be the same for positive and negative ions. (a) Number i (b) Number Units Units

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