Đáp án:
\(\begin{array}{l}
a.\\
E = 2250000\\
b.\\
E = 636396\\
c.\\
E = 1272792
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
a.\\
{E_1} = k\frac{{{q_1}}}{{A{C^2}}} = {9.10^9}.\frac{{{{16.10}^{ - 8}}}}{{2.0,{{02}^2}}} = 1800000\\
{E_2} = k\frac{{{q_2}}}{{B{C^2}}} = {9.10^9}.\frac{{{{9.10}^{ - 8}}}}{{2.0,{{03}^2}}} = 450000\\
E = |{E_1} - {E_2}| = 1800000 + 450000 = 2250000\\
b.\\
{E_1} = k\frac{{{q_1}}}{{A{C^2}}} = {9.10^9}.\frac{{{{16.10}^{ - 8}}}}{{2.0,{{05}^2}}} = 288000\\
{E_2} = k\frac{{{q_2}}}{{B{C^2}}} = {9.10^9}.\frac{{{{9.10}^{ - 8}}}}{{2.0,{1^2}}} = 40500\\
E = 288000 - 40500\\
c.\\
{E_1} = k\frac{{{q_1}}}{{A{C^2}}} = {9.10^9}.\frac{{{{16.10}^{ - 8}}}}{{2.0,{{04}^2}}} = 450000\\
{E_2} = k\frac{{{q_2}}}{{B{C^2}}} = {9.10^9}.\frac{{{{9.10}^{ - 8}}}}{{2.0,{{03}^2}}} = 450000\\
E = \sqrt {{E_1}^2 + {E_2}^2} = \sqrt {{{45000}^2} + {{45000}^2}} = 636396
\end{array}\)
