Mathematics · Electrostatics
A cube of side 'a' has point charges +Q located at each of its vertices except at the origin where the charge is -Q. The electric field at the centre of the cube is:
- 12Q3√3πε0a2 (x̂ + ŷ + ẑ)
- 2-2Q3√3πε0a2 (x̂ + ŷ + ẑ)✓
- 3Q3√3πε0a2 (x̂ + ŷ + ẑ)
- 4-Q3√3πε0a2 (x̂ + ŷ + ẑ)
Correct answer
-2Q3√3πε0a2 (x̂ + ŷ + ẑ)
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