F= \frac{20*30*9* 10^{9} }{ 30000^{2} } ; =>F= \frac{9* 10^{4} }{15} =0.6* 10^{4} =6000H; " alt="F=k* \frac{ q_{1}* q_{2} }{ r^{2} } ;
=> F= \frac{20*30*9* 10^{9} }{ 30000^{2} } ; =>F= \frac{9* 10^{4} }{15} =0.6* 10^{4} =6000H; " align="absmiddle" class="latex-formula">
кН