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Q. Charges $q, 2 q, 3 q$ and $4 q$ are placed at the corners $A, B, C$ and $D$ of a square as shown in the following figure. The direction of electric field at the centre of the square is alongPhysics Question Image

Electric Charges and Fields

Solution:

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$E_{A}=E, E_{B}=2 E, E_{C}=3 E, E_{D}=4 E$