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1. |
A certain wire has a resistance \[R\]. The resistance of another wire identical with the first except having twice its diameter is [CPMT 1999] |
A. | \[2\,R\] |
B. | \[0.25\,R\] |
C. | 0.1 m |
D. | \[0.5\,R\] |
Answer» C. 0.1 m | |