Current Electricity and Electrical InstrumentMedium
Question
If a wire is stretched to make it 0.1% longer, its resistance will :
Options
A.increase by 0.2%
B.decrease by 0.2%
C.decrease by 0.05%
D.increases by 0.05%
Solution
R ∝ I2 (for a given volume)
⇒
Thus when wire is stretched by 0.1% resistance increases by 0.2%.
⇒
Thus when wire is stretched by 0.1% resistance increases by 0.2%.
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