A wire has a resistance R . what will be its resistance if it is stretched so that its length is doubled
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Answer:
4r is the resistance. hope you understand please mark brainliest.
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Answer: Let the R be resistance, l be the length of the wire.
According to question,
Length is doubled means now it is 2l and area gets decreased by 2 times.
By the formula of resistivity,
⇒ Resistivity = (Area × Resistance)/length
⇒ Resistance = (Resistivity × length)/Area
(After Changing length to 2l)
⇒ R = (p×2l)/A/2
⇒ R = (p×4l)/A
As we know that Resistance is directly proportional to length then,
→R∝l
→R∝4l [Thererefore, R is increased by 4 times.]
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