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एक तार का प्रतिरोध `4.0Omega`हैं | यदि इसे खींचकर दुगुना किया जाय तो इसका प्रतिरोध कितना होगा ?

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एक तार का प्रतिरोध `4.0Omega`हैं | यदि इसे खींचकर दुगुना किया जाय तो इसका प्रतिरोध कितना होगा ?
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सूत्र- `(R_(1))/(R_(2))=(l_(1)^(2))/(l_(2)^(2))`से,
दिया हैं : `l_(2)=2l_(2),R_(1)=4.0Oemga`.
सूत्र में मान रखने पर,
`(4)/(R_(2))=((l_(1))/(2l_(1)))^(2)`
या `" "R_(2)=4xx(4l_(1)^(2))/(l_(2))`
या `" "R_(2)=16Omega`.
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