The resistivity of a copper wire is 1.76*10^-8 ohm m. the radius of wire is 1mm.Calculate the length of a telegraph wire needed for having a resistance of 10.5 ohm.
Plz solve this!!
Answers
Answered by
6
Step-by-step explanation:
l =length of wire
R = resistance
a =area of wire = π*(1*10^-3)^2
rho =resistivity of wire
length = resistance*area/resistivity
= 10.5*(π*1)*10-6/(1.76*10^-8)
= 3.2986*10^-5/(1.76*10^-8)
length = 1.874*10^3 m
= 1.874 km
Similar questions