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Three infinite plane sheets carrying uni...

Three infinite plane sheets carrying uniform charge densities `-sigma , 2 sigma , 4 sigma ` are placed parallel to XZ plane at Y = a, 3a, 4a respectively. The electric field at the point (0, 2a, 0) is

A

A. `(5 sigma )/( 2 epsi_0) hatj`

B

B. `-(7 sigma)/( 2 epsi_0) hatj`

C

C. `( sigma )/(2 epsi_0) hatj`

D

D. `(5 sigma )/(-2epsi_0) hatj`

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