[tex]3.\\\\Dane:\\I = 20 \ mA = \frac{20}{1000} \ A = 0,02 \ A\\q = 2 \ C\\Szukane:\\t = ?\\\\I = \frac{q}{t} \ \ \rightarrow \ \ t = \frac{q}{I}\\\\t = \frac{2 \ C}{0,02 \ A} =\frac{2 \ A\cdot s}{0,02 \ A}\\\\\boxed{t = 100 \ s = 1 \ min \ i \ 40 \ s}[/tex]
[tex]4.\\\\Dane:\\I = 40 \ mA = \frac{40}{1000} \ A = 0,04 \ A\\t = 2 \ min = 2\cdot60 \ s = 120 \ s\\Szukane:\\q = ?\\\\I = \frac{q}{t} \ \ /\cdot t\\\\q = I\cdot t\\\\q = 0,04 \ A\cdot 120 \ s\\\\\boxed{q = 4,8 \ C}[/tex]
