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A disk of radius a//4 having a uniformly...

A disk of radius `a//4` having a uniformly distributed charge 6 C is placed in the xy plane with its center at `(-a//2,0,0)`. A rod of length carrying a uniformly distributed charge 8 C is placed on the x-axis from `x = a//4 to x = 5a//4`. Two point charges `-7C and 3C` are placed at `(a//4,-a//4,0) and (-3a//4,3a//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

`(-2C)/epsi_(0)`

B

`(2C)/epsi_(0)`

C

`(10C)/epsi_(0)`

D

`(12C)/epsi_(0)`

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The correct Answer is:
A
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