Question
a disk of radius a/4 having a uniformly distributed charge 6C is placed in the x-y plane with its centre at(-a/2,0,0).A rod of lenght a carring a uniformly distributed charge 8C 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=\pm a/2,y=\pm a/2,z=\pm a/2.The electric flux through this cubical surface i