Four charges $+Q$, $-Q$, $+Q$ and $-Q$ are situated at the corners of a square in a sequence then at the centre of the square:
- A$E=0,\ V=0$
- B$E\ne0,\ V\ne0$
- C$E\ne0,\ V=0$
- D$E=0,\ V\ne0$
✓ Correct answer: A
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