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Q.

ABCD is a square of side Length l and O is its centre. The line OP is perpendicular to the plane of the square and OP= l/2. A point charge Q is placed at point P. Then electric flux through the square ABCD is 

 

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a

Qε0

b

Q8ε0

c

Q4ε0

d

Q6ε0

answer is D.

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Detailed Solution

(4)

Construct a cube of length ‘l’ Point P is the centre of cube. Charge Q is placed at P.

  Flux through 6 faces of the cube = Qε0

 Flux through each face  = a6ε0

 

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