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Three charges each equal to $q$ are placed at the corners of an equilateral triangle of side $a$. What is the electric field $\vec{E}$ at the centroid of the triangle?
- A.$0$
- B.$3kq/r^2$
- C.$kq/a^2$
- D.$\sqrt{3}kq/a^2$
Show correct answer & step-by-step solution
Correct answer: A — $0$
Solution
By symmetry, at the centroid because the vectors are equal in magnitude and separated by .
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