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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 | |