65
punti
Livello 1
es11
Q=-7.2*10^-9 C
Q/e = 7.2*10^-9 / (1.6*10^-19) = 45*10^9 ne
numeromoli = ne/N = 45*10^9 /(6.02*10^23) = 7.475... × 10^14
Stot =2*pi*r*h + 2*pi*r² = 2pi*8*10^-3*22*10^-3+ 2pi*(8*10^-3)² = (3 π)/6250
sigmamedio = -7.2*10^-9/((3 π)/6250) = -4.77465... × 10^-6 C/m²
es12
Q =~ sigma*l² ---> l = ~ sqrt(Q/sigma) = sqrt((n*e*N)/sigma) = sqrt(e) sqrt((n N)/σ) = 0.0261793 m = 2.6 cm
7583
punti
Livello 5