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Three points charges +q,-2q and +q are p...

Three points charges +q,-2q and +q are placed at points (x=0,y=a,z=0),(x=0,y=0,z=0)and (x=a,y=0,z=0) respectively.The magnitude and direction of the electric dipole moment vector of this charge assembly are .

A

`sqrt 2`qa along + x direction

B

`sqrt 2`qa along + y direction

C

`sqrt 2`qa along the line joining points (x=0,y=0,z=0)and()x=a,y=a,z=0)

D

qa along the line joining points(x=0,y=0,z=0)and (x=a,y=a,z=0)

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