Gujarat Class 10 Answered
The resistance of the copper wire of length 2 metre and 1.7×10 raised to minus 6 metre square area of cross-setion is 20 × 10 raised to minus 2 . What is its resistivity?
Asked by prahladsinhchudasama6463 | 23 Jul, 2019, 11:56: AM
Expert Answer
Only one question should be asked in one posting. Hence only question given in text is answered.
Length l = 2 m ; cross section area A = 1.7×10-6 m2 ; Resistance R = 20×10-2 Ω
we have, Resistance R = ρ×(l/A) , where ρ is resistivity in Ω-m
Hence ρ = (R×A)/ l = ( 20×10-2 × 1.7×10-6 )/ 2 = 1.7×10-7 Ω-m
Answered by Thiyagarajan K | 23 Jul, 2019, 02:42: PM
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