003) Use equation,
I= dq/dt =(ne)/dt
75.7*10^-3=( n*1.602*10^-19)/(9.4*60) => n=2.67*10^20
004)
Resistance for 0.17m , R = (2.39*10^-5)*0.17 = 4.063*10^-6 ohm
V=I*R = 122A* 4.063*10^-6 ohm = 0.000496 V = 496 microV
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