Q.

A point charge Q is placed at the corner F of a cube. Then electric flux through the face ABCD is

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a

Q24e0

b

Q12e0

c

Q18e0

d

Q8e0

answer is A.

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Detailed Solution

Net charge enclosed by the cube =Q8Net flux over its surface =Q8ε0Flux through the three surfaces EFGH, BFGC and AEFB is zero.So the net flux is equally shared by remaining three surfaces. Flux through ABCD =13 x Q8ε0=Q24ε0
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A point charge Q is placed at the corner F of a cube. Then electric flux through the face ABCD is