8-point charges of 1 nc each are located at the corners

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8-point charges of 1 nc each are located at the corners of a cube in free space that is 1 m on a side, then ^→E at the centre is—

1. 0 V/m
2. 5 V/m
3. 4 V/m
4. – 5 V/m

Correct Option: A

^→E at the centre is always zero.