Resistance and Resistivity: The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the new resistance of this wire?
A. It is 2 times as large.
B. It is 4 times as large.
C. It is 6 times as large.
D. It it 8 times as large.
E. It is ½ as large.
Answer: D
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