"E=E_1+E_2=kQ(\\frac 1{l^2}+\\frac{1}{R^2})=0.45~\\frac{MN}{C},"
"F=F_1+F_2=\\frac{kQ\\sigma l}{l^2}+\\frac{kQ\\sigma 2\\pi R}{R^2}=kQ\\sigma (\\frac 1 l+\\frac{2\\pi}{R})=122~GN."
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