Four charges $ + Q,\, - Q,\, + Q,\, - Q$ are placed at the corners of a square taken in order. At the centre of the square

  • A

    $E = 0,\,V = 0$

  • B

    $E = 0,\,V \ne 0$

  • C

    $E \ne 0,\,V = 0$

  • D

    $E = 0,\,V \ne 0$

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  • [JEE MAIN 2021]