[填空题]
A 5.80-m length of 2.0-mm-diameter wen5nukw j 25 j*g+be+1q7cnnj ire carries a 750-mA gwd1hgs m//u6* av:sh current when 22.0 mV is applied to its ends. If the drift sp gd*mga/vs6u/hwh:1seed 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$
