2.
[tex]Dane:\\q_1 = +8 \ nC\\q_2 = +2 \ nC\\Szukane:\\q = ?\\\\q = \frac{q_1+q_2}{2} = \frac{+8 \ nC + 2 \ nC}{2} = \frac{+10 \ nC}{2} =+5 \ nC\\\\2 \ nC - 5 \ nC = -3 \ nC\\\\\underline{Odp. \ D.}[/tex]
3.
[tex]e = -1,6\cdot10^{-19} \ C\\\\1 \ mol = 6\cdot10^{23} \ elektronow = 6\cdot10^{23}\cdot(-1,6)\cdot10^{-19} \ C =-96\cdot10^{4} \ C\\\\\underline{Odp. \ D.}[/tex]
4.
[tex]F_{c} = 2\cdot10^{-7} \ N\\\\F_{c} = k\cdot\frac{q_1\cdot q_2}{r^{2}}\\\\dla: \ \ \frac{q_1}{2} \ oraz \ \frac{q_2}{2}\\\\F_{c_1}= k\cdot\frac{\frac{q_1}{2}\cdot\frac{q_2}{2}}{r^{2}} = \frac{1}{4}\cdot k\cdot\frac{q_1\cdot q_2}{r^{2}} = \frac{1}{4}F_{c}\\\\\underline{Odp. \ C.}[/tex]
5.
[tex]1.\\U = 9 \ N\\q = 2 \ C\\\\W = U\cdot q = 9 \ V\cdot2 \ C = 18 \ J\\\\2.\\U_1 = \frac{1}{2}U=\frac{1}{2}\cdot 9V = 4,5 \ V\\q = 2 \ C\\\\W_1 = U_1\cdot q = 4,5 \ V\cdot2 \ C = 9 \ J\\\\Odp. \ A. \ oraz \ C.[/tex]
