Ответ: m*V^2/R=q*B*VT=2*pi*R/Vv=V/2*pi*R=q*B/2*pi*mv1=q*B/2*pi*mеv2=q*B/2*pi*mpv1/v2=mp/mе=1,67*10^-27/9,1*10^-31=1800/1