Dane:
[tex]r = 0,5m\\E = 4,5\frac{N}{C}[/tex]
[tex]k = 8,99*10^9\frac{N*m^2}{C^2}[/tex]
Szukane:
[tex]Q = ladunek~punktowy[/tex]
[tex]E = \frac{F}{q} \\F = \frac{k*Q*q}{r^2} \\E = \frac{ \frac{k*Q*q}{r^2} }{q} = \frac{k*Q}{r^2}[/tex]
[tex]Q = \frac{E*r^2}{k} = \frac{4,5*0,5^2}{8,99*10^9} \approx 1,25*10^{-10} C[/tex]
