
Concept explainers
(a)
The room temperature resistance of the aluminum wire.
(a)

Answer to Problem 63E
The room temperature resistance of the aluminum wire is
Explanation of Solution
Given that the length of the wire is
Write the expression for the resistance in terms of dimensions of the conductor.
Here,
Write the expression for the cross sectional area of the wire.
Here,
Use equation (II) in (I).
Conclusion:
Substitute
Therefore, the room temperature resistance of the aluminum wire is
(b)
The radius of the copper wire with same resistance as of aluminum.
(b)

Answer to Problem 63E
The radius of the copper wire with same resistance as of aluminum is
Explanation of Solution
Solve equation (III) for
It is obtained that the resistance is
Conclusion:
Substitute
Therefore, the radius of the copper wire with same resistance as of aluminum is
(c)
To compare the weight of aluminum wire and copper wire.
(c)

Answer to Problem 63E
The weight of aluminum is
Explanation of Solution
Given that the length of both wires is
Write the expression for the mass in terms of the density.
Here,
Write the expression for the volume of the wire.
The ratio of weights will be equal to the ratio of masses of the two wires.
Here,
Use the expression for the volume in equation (VII) (consider the equal lengths of the wire).
Conclusion:
Substitute
Therefore, the weight of aluminum is
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Chapter 17 Solutions
General Physics, 2nd Edition
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