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

Q4ε0

c

Q8ε0

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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