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227f11hw05ans

# 227f11hw05ans - MasteringPhysics Assignment Print View...

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H5 Current, Resistance and DC Circuits (25.1-25.6) Due: 11:59pm on Monday, October 10, 2011 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy Exercise 25.4 Description: An 18-gauge copper wire (diameter 1.02 mm) carries a current with a current density of J. Copper has 8.5 * 10^28 free electrons per cubic meter. (a) Calculate the current in the wire. (b) Calculate the drift velocity of electrons in the wire. An 18-gauge copper wire (diameter 1.02 ) carries a current with a current density of 1.20 × 10 6 . Copper has free electrons per cubic meter. Part A Calculate the current in the wire. Express your answer using two significant figures. ANSWER: = Part B Calculate the drift velocity of electrons in the wire. Express your answer using two significant figures. ANSWER: = Exercise 25.13 Description: In an experiment conducted at room temperature, a current of I flows through a wire d in diameter. (a) Find the magnitude of the electric field in the wire if the wire is made of tungsten. (b) Find the magnitude of the electric field in the wire if... In an experiment conducted at room temperature, a current of 0.900 flows through a wire 2.56 in diameter. Settings per Student Student View Summary View Diagnostics View Print View with Answers MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrintView... 1 of 13 9/23/11 3:05 PM

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Part A Find the magnitude of the electric field in the wire if the wire is made of tungsten. ANSWER: = Part B Find the magnitude of the electric field in the wire if the wire is made of aluminum. ANSWER: = Exercise 25.16 Description: (a) What length of copper wire, 0.462 mm in diameter, has a resistance of 1.00 Omega? Part A What length of copper wire, 0.462 in diameter, has a resistance of 1.00 ? ANSWER: = Exercise 25.18 Description: (a) What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter d? Part A What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter 3.35 ? MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrintView... 2 of 13 9/23/11 3:05 PM
ANSWER: = Problem 25.21 Description: As part of a lecture demonstration, a physics professor plans to hold an uninsulated current-carrying wire in her hands. For safety's sake, the potential difference between her hands is to be no more than V. She holds her hands separated by a distance ... As part of a lecture demonstration, a physics professor plans to hold an uninsulated current-carrying wire in her hands. For safety's sake, the potential difference between her hands is to be no more than . She holds her hands separated by a distance of , with the wire stretched tightly between them. The wire is to carry a current of and is to be made of aluminum.

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