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IIT JEE Advanced 2009 Paper 1

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Question : 4

Total: 60

A disk of radius a/4 having a uniformly distributed charge 6 C is placed in the xy-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 = 5a/4. Two point charges -7 C and 3 C 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

−2C
ε0
2C
ε0
10C
ε0
12C
ε0

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