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4B Homework 06
*Question 1
A potential difference of 3.32 nV is set up across a 2.13 cm length of copper wire that has a radius of 2.29 mm. How
much charge (in C) drifts through a cross section in 3.11 ms? Assume that the resistivity of copper is 1.69 × 10
8
Ω·m.
Number
4.73E7
Units
C
The number of significant digits is set to 3; the tolerance is +/2%
*Question 2
A certain wire has a resistance of 110 Ω. What is the resistance of a second wire, made of the same material, that is
1/4 as long and has 1/2 the diameter?
Number
110
Units
Ω
The number of significant digits is set to 2; the tolerance is +/2%
*Question 3
A wire is 0.94 m long and 1.2 mm
2
in crosssectional area. It carries a current of 4.2 A when a 2.0 V potential
difference is applied between its ends. Calculate the conductivity σ of the material of which this wire is made.
Number
1600000
Units
(Ω·m)1
The number of significant digits is set to 2; the tolerance is +/2%
*Question 4
The figure shows wire section 1 of diameter
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This note was uploaded on 11/17/2010 for the course PHYC 4B taught by Professor Afdsadsf during the Spring '09 term at City College of San Francisco.
 Spring '09
 afdsadsf

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