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Asked by Atharva Last Modified
Answer 
Mayuresh Bhatghare
Maths Tutor
R=P(l/A), R denotes resistance of wire
P denotes resistivity,
l denotes length of wire,
A denotes area of cross section of wire.
Diameter = 0.2mm,
Hence radius=diameter/2=0.2/2=0.1mm=0.1/1000 m.
10=P(1/(22/7)*(0.1/1000)*(0.1/1000))
10=P(1/3.1415*10^-8)
Here ^ stands for power of index.
P=3.1415*10^-7 ohm-m.
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