CBSE Class 12-science Answered
If a copper wire is steched to make 0.1% thinner, then what is the percentage increase in resistance
Asked by tangocharliee | 11 Nov, 2009, 02:25: PM
Expert Answer
Streching elongates the wire, while simultaneously making it thinner.
Initial Volume = Final Volume
AiLi = AfLf
AiLi = 0.999AiLf
Lf = Li/0.999
Rf = ρLf/Af = ρLi/(0.9992xAi)
Rf = 1.002ρLi/Ai = 1.002Ri
The resistance increases by 0.2%.
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TopperLearning.
Answered by | 11 Nov, 2009, 04:01: PM
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