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  4. What is the electric field at the centroid of an equilateral triangle of side length r , carrying charge q at each corner?

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Q. What is the electric field at the centroid of an equilateral triangle of side length $ r $ , carrying charge $ q $ at each corner?

J & K CETJ & K CET 2019Electric Charges and Fields

Solution:

Three electric fields will be equal in magnitude and opposite in direction. Therefore, electric field at the centre $O$ is zero
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