\( \mathrm{ABC} \) is an equilateral triangle. Charges \( +\mathrm{q} \) are placed at each corn...

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\( \mathrm{ABC} \) is an equilateral triangle. Charges \( +\mathrm{q} \) are placed at each corner. The electric intensity at \( \mathrm{O} \) will be
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(1) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{q}{r^{2}} \)
(2) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{q}{r} \)
(3) Zero
(4) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{3 \mathrm{q}}{\mathrm{r}^{2}} \)
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