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CarmellaStoltzfus CarmellaStoltzfus
  • 07-07-2014
  • Physics
Answered

A wire 2 m long, 0.1 mm in diameter and has resistance of 20 ohm. Calculate the resistivityof its material.

Verified Answer :

luana
luana luana
  • 29-07-2014

R=\(\frac{pL}{A}\)

R-resistance
p-resistivity [Ohmm]
A-cross sectional area
L-length
R=20 Ohm
l=2m
A=\(\pi r^{2}\)=\(\pi (0,01)^{2} =0,000314 cm^{2}\)=0,314\(10^{-7}\)m²
p=\(\frac{R*A}{L}\)
p=\(\frac{20*0,314*10^{-7}}{2}\)=0,000000314 Ohm*m

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