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    Exam 21: Electric Current and Direct-Current Circuits
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    The Length of a Certain Wire Is Doubled and at the Same
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The Length of a Certain Wire Is Doubled and at the Same

Question 57

Question 57

Multiple Choice

The length of a certain wire is doubled and at the same time its radius is tripled. What is the change in the resistance of this wire?


A) It stays the same.
B) It is reduced by a factor of 4.5.
C) It is doubled.
D) It is tripled.
E) It is quadrupled.

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