Two north poles each of pole strength `8Am` are placed at corners `A` and `C` of a square `ABCD`. The pole that should be placed

Two north poles each of pole strength `8Am` are placed at corners `A` and `C` of a square `ABCD`. The pole that should be placed at `B` to make `D` as null point is
A. North pole of pole strength `8sqrt2Am`
B. North pole of pole strength `16sqrt2Am`
C. south pole of pole strength `16sqrt2Am`
D. south pole of pole strength `8sqrt2Am`

Two north poles each of pole strength `8Am` are placed at corners `A` and `C` of a square `ABCD`. The pole that should be placed at `B` to make `D` as

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