In a cuboid of dimension 2L × 2L × L , a charge q is placed at the centre of the surface S having area of 4 L ^ 2 . The flux through the opposite surface to S is given by

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Correct answer: D. q 6 ∈ _ 0

Assume a similar cuboid on top of the given cuboid to make symmetry about charge. Thus, it becomes a cube of length $2L$ .

In a cuboid of dimension 2L × 2L × L , a charge q is placed at the centre of the surface S having area of 4 L ^ 2 . The

Flux passing through whole cube is $ϕ = \dfrac{q}{{\in}_{0}}$ (Gauss's Law).

Since, total faces are $6$ , so flux passing through shaded face $= \dfrac{q}{6{\in}_{0}}$ .

In a cuboid of dimension 2L × 2L × L , a charge q is placed at the...

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