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Three infinite long charged sheets of ch...

Three infinite long charged sheets of charge densities `-sigma,-2sigma and sigma` are placed parallel to,y-plane at z= 0, z= a, z= 3a. Electric field at point Pis given as :

A

`-(2sigma)/(in_(0))hatk`

B

`(2sigma)/(in_(0))hatk`

C

`(-4sigma)/(in_(0))hatk`

D

`(4sigma)/(in_(0))hatk`

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