εm = 8,85*10^−12 F∕m
ε1 = 2,1
C = εm*ε1*A/d = 8,85*10^−12*2,1*4*10^-4*10^3/2 = 3,72*10^-12 F
Q = C*V = 3,72*10^-10 Coulomb
campo elettrico E = 100*10^3/2 = 5*10^4 V/m
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