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A disk of radius a / 4 having a uniformly distributed charge \( 6 \mathrm{C} \) is placed in the \( \mathrm{x} \)-y plane with its centre at \( (-\mathrm{a} / 2,0,0) \). A rod of length a carrying a uniformly distributed charge \( 8 \mathrm{C} \) is placed on the \( \mathrm{x} \)-axis from
\( \mathrm{P} \) \( x=a / 4 \) to \( x=5 a / 4 \). Two point charges \( -7 C \) and \( 3 C \) are placed at \( (a / 4,-a / 4,0) \) and \( (-3 a / 4,3 a / 4,0) \), respectively. Consider a cubical surface formed by six surfaces \( x=\pm a / 2, y=\pm a / 2, z=\pm a / 2 \). The
W electric flux through this cubical surface is
(A) \( \frac{-2 \mathrm{C}}{\varepsilon_{0}} \)
(B) \( \frac{2 \mathrm{C}}{\varepsilon_{0}} \)
\( (\mathrm{C}) \frac{10 \mathrm{C}}{\varepsilon_{0}} \)
(D) \( \frac{12 \mathrm{C}}{\varepsilon_{0}} \)
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