Answers

2016-05-06T21:48:33+05:30
Here , 
 L = 10000m
 D = 2mm
 r = D/2 = 1 × 10^(-3)m
 P = 2.7 × 10^(-8)ohm m
 R =  ?
 we know that , 
  R = pL/A
  A = πr²
  A = 22/7 × 1 × 10^[(-3)]²
  R = 2.7 × 10^(-8) × 1000 × 1/[ 22/7 × 1 × 10^[(-3)]² ]
  R = 85.9 ohm 
≈ 86 ohm
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can u pls answer the other question
which one?
calculate the resistivity of copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7×10-8
a wire is 1.0 m long ,2.0mm in diameter and has a resistance of 10 ohms.calculate the resistivity of material
plss answer these questions pls