1
${{۱۰}^{۴}}(\overrightarrow{i}+۳\overrightarrow{J})$
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2
$۳\times {{۱۰}^{۴}}\,(\overrightarrow{i}-\overrightarrow{J})$
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3
$۳\times {{۱۰}^{۴}}\,(\overrightarrow{i}+\overrightarrow{J})$
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4
${{۱۰}^{۴}}\,(\overrightarrow{i}-۳\overrightarrow{J})$
✓
✗
خطا
${{E}_{1}}=(\frac{9\times {{10}^{9}}\times 9\times {{10}^{9}}}{3\times 9\times {{10}^{-4}}})\frac{N}{C}=3\times {{10}^{4}}\frac{N}{C}\Rightarrow \overrightarrow{{{E}_{1}}}=(3\times {{10}^{4}}\frac{N}{C})\overrightarrow{j}$ ${{E}_{2}}=(\frac{9\times {{10}^{9}}\times 3\times {{10}^{-9}}}{9\times {{10}^{-4}}})\frac{N}{C}=3\times {{10}^{4}}\frac{N}{C}\Rightarrow \overrightarrow{{{E}_{2}}}=(3\times {{10}^{4}}\frac{N}{C})\overrightarrow{i}$ $\overrightarrow{{{E}_{T}}}=\overrightarrow{{{E}_{1}}}+\overrightarrow{{{E}_{2}}}\Rightarrow \overrightarrow{{{E}_{T}}}=3\times {{10}^{4}}(\overrightarrow{i}+\overrightarrow{i}$