NEET 2004 Physics question

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:-

(1)The resistance will be halved and the specific resistance will remain unchangedCorrect
(2)The resistance will be halved and the specific resistance will be doubled
(3)The resistance and the specific resistance, will both remain unchanged
(4)The resistance will be doubled and the specific resistance will be halved

Answer: (1)

Solution

. When and : , so the resistance is halved. The specific resistance

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Question ID VK-089336