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A wire of resistance `R` is elongated `n-fold` to make a new uniform wire. The resistance of new wire.A. nRB. `n^(2)R`C. `2nR`D. `2n^(2)R` |
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Answer» Correct Answer - B The resistance of a wire is directly proportional to the length of the wire. Thus `R prop l`, so the length increases n-fold also since the volume of the wire remains constant, so the area of the wire decreases n-fold. Hence, the resistance increases to `n^(2)R` as the area is inversely proportional to resistance. |
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