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resistance = resistivity * length / area
R = ρl / A
A = πr^2
r = 1mm =0.1cm= 0.001
R = 1.72 * 10^-8 * 100 / 3.14 * 0.001
R= 1. 72 * 10 ^-6 / 3 .14* 10 ^ -3
R = 0.54 * 10^ -3
anmolsk111pdp7rg:
You r wrong
yeah, bcoz u have considered 'r' in CGS unit while others are in SI units
plz have a look on the unit of rho ( resistivity )
U need not look on the unit of resistivity, i.e., rho! bcoz it is SI unit
i did take r in metres
it is not in centimeter , i mm = 0.001m
The correct ans. is 0.54
oh yes , just put r^2 so u ll get 10 ^-6, then ur ans would be 0.54!
Answered by
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R= ρL/A
Here, L(length)=100 m
radius= 1mm= 10^-3m
A(area)= π(radius)^2
ρ(resistivity)= 1.72×10^-8 Ωm
now solve it by the above equation
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