Q.

Four identical charges Q are fixed at the four corners of a square of side a. The electric field at a point P located symmetrically at a distance a/2 from the centre of the square is  

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a

Q2πε0a2

b

22  Qπε0a2

c

Q22πε0a2

d

2  Qπε0a2

answer is B.

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Enet=4Ecosθ=44πε0Qa212=Q2  πε0a2

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