A) \[\frac{1}{4\pi {{\in }_{0}}}\frac{q}{r}\]
B) \[\frac{1}{4\pi {{\in }_{0}}}\frac{q}{{{r}^{2}}}\]
C) \[\frac{1}{4\pi {{\in }_{0}}}\frac{3q}{{{r}^{2}}}\]
D) Zero
Correct Answer: D
Solution :
[d] Unit positive charge at 0 will be repelled equally by three charges at the three corners of triangle. By symmetry, relsultant \[\vec{E}\] at O would be zero.
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