The electric resistance of a certain wire of iron is R. If its length and radius are both…
Physics · JEE Main · NTA Exams — Current Electricity
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:
- the resistance will be doubled and the specific resistance will be halved
- the resistance will be halved and the specific resistance will remain unchanged
- the resistance will be halved and the specific resistance will be doubled
- the resistance and the specific resistance, will both remain unchanged
Answer
(B) the resistance will be halved and the specific resistance will remain unchanged
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