(a)
the ratio of resistance of silver wire to the copper wire.
(a)
Answer to Problem 37P
The ratio of resistance of silver wire to the copper wire is
Explanation of Solution
Write the equation for resistance.
Here,
Write the equation for mass density.
Here,
Substitute value of
Here,
Conclusion:
Substitute
Therefore, the ratio of resistance of silver wire to the copper wire is
(b)
the ratio of resistance of aluminum wire to the copper wire.
(b)
Answer to Problem 37P
The ratio of resistance of aluminum wire to the copper wire is
Explanation of Solution
If the wires have the same length and same mass, then resistance can be written as,
Here,
Conclusion:
Substitute
Therefore, the ratio of resistance of aluminum wire to the copper wire is
(c)
the best
(c)
Answer to Problem 37P
The best conducting material among silver and aluminum is aluminum.
Explanation of Solution
For the wires with equal length and equal mass, the ratio of resistance shows that aluminum is the best conductor.
Conclusion:
Among the materials aluminum has the lowest resistance value.
Therefore, the best conducting material among silver and aluminum is aluminum.
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Chapter 18 Solutions
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