Resistance and Resistivity: The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A. It is increased by a factor of 2.
B. It is increased by a factor of 4.
C. It is reduced by a factor of 2.
D. It is reduced by a factor of 4.
E. It is reduced by a factor of 8.
Answer: D
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