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Asked by Vathsala Last Modified
Answer 
R = (rho x l)/ A, where rho is resistivity, R= resistance, l= length of wire and A= cross sectional area.
This gives us rho = RA/l, l= 1m, R= 10 ohm
Since diameter= 0.2 mm = 2x 10^(-4) m, radius = 1x 10^(-4) m
Hence, area= pi*10^(-8)
On substituting, rho= 10pi*10^(-8) = pi x 10^(-7) Ohm m.
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