Four charges of $1\  \mu C, 2\  \mu C, 3\  \mu C,$ and $- 6\ \mu C$ are placed one at each corner of the square of side $1\,m$. The square lies in the $x-y$ plane with its centre at the origin.

  • A

    The electric potential is zero at the origin.

  • B

    The electric potential is zero everywhere along the $x-$axis only of the sides of the square are parallel to $x $ and $y$ axis.

  • C

    The electric potential is zero everywhere along the $z-$axis for any orientation of the square in the $x- y$ plane.

  • D

    $A$ and $C$ both

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