Question:
R=26 ohm's of L=1m,r=1/pi mm. T=20 degree's then resistivity=
Answer:
Resistance = (resistivity x length)/cross sectional area
Cross sectional area = πr2
= π x 1/π x 1/π x 10-3 meter2
= 1/π m2
So, Resistivity = (cross sectional area x resistance)/ length
= (1/π x 26)/1
= 26/π
Resistivity = 26/π ohm metre.
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