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Dane:
q=0,4[uC]=4*10^-7[C].
E=5*10^4[N/C].
Wzory:
E=F/q.
F=E*q.
Jednostka:
[F]=[N/C*C]=[N].
Obliczenia:
F=5*10^4*4*10^-7=20*10^-3=2*10*10^-3=2*10^-2[N].
Odp.b).