## anonymous 4 years ago A silver wire 2m long is to have a resistance of 0.5ohm.What should its diameter be?

simple $\rho(resistivity)=1.59*10^{-8}\Omega m$ this value is for silver just. use the formula, $R=\rho L/A$ $A=\rho L/R$ $\pi(d/2)^{2}=\rho L/A$ $(d/2)^{2}=\rho L/\pi A$ $(d/2)=\sqrt{\rho L/\pi A}$ $d=2\sqrt{\rho L/\pi A}$ now you can calculate diameter by using above formula. Regards, Read my Profile. :D