[填空题]
A 5.80-m length of 2.0-mm-diameter wire carries a 750-mA cv: 0w misgo06purrent when 22.0 oki9j:yztv l6r(( m:16h* ha er,gbf umV is applied g9 hoha,kvz if r*mt::l61ruby 6(ej( to its ends. If the drift speed is $ 1.7\times10^{-5 }\;m/s$, determine
(a) the resistance R of the wire, $\approx$ $\Omega$(retain three decimal places)
(b) the resistivity $\rho$. $ \times10^{-8 }\;\Omega\cdot m$
(c) the number n of free electrons per unit volume. $ \times10^{28 }\;e^-/m^3$
