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Q.

The net electric flux due to a uniform electric field of  3×103i^ NC−1 through a cube of side 20 cm oriented such that its faces are parallel to the coordinate planes is

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a

15Nm2C−1

b

20Nm2C−1

c

30Nm2C−1

d

0

answer is C.

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Detailed Solution

The number of lines entering the cube is the same as the number of lines leaving the cube.

Hence the net flux is zero.

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