A. 1/9 times
B. 3 times
C. 9 times
D. unchanged
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6 Comments
the resistance of wire is directly proportional to its length so if the length increases to three time then the resistance become three time hence the answer is 3 times.
According to formula:
R’=n^2×R
It will be 9 times as:
R’=3^2×R
= 9R