A disc of radius a/4 having a uniformly distributed charge 6 C is placed in the x y-plane with it...

A disc of radius a/4 having a uniformly distributed charge 6 C is placed in the x y-plane with its centre at (-a/2, 0,0). A rod of length a carrying a uniformly distributed charge 8 C is placed on the X-axis from x=a/4 to x=5 a/4. Two point charges -7 C and 3 C are placed at (a/4, -a/4., o ) and (-3 a/4, 3 a/4, 0), respectively. Consider a cubical surface formed by six surfaces x=±a/2, y=±a/2, z=±a/2. The electric flux through this cubical surface is
(a) -2 C/ε_0
(b) 2 C/ε_0
(c) 10 C/ε_0
(d) 12 C/ε_0

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