Question
The specific resistance σ of a thin wire of radius r cm, resistance R Ω and length L cm is given by σ=(πr²R)/L. If r=0.26±0.02cm, R=32±1Ω and L=78 ± 0.01 cm,find the percentage error in σ.
Options :
20%
21%
18%
22%
Answer :
18%
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