Four charges are arranged at the corners of a square $ABCD$, as shown in the adjoining figure. The force on the charge kept at the centre $O$ is
Four charges are arranged at the corners of a square $ABCD$, as shown in the adjoining figure. The force on the charge kept at the centre $O$ is
- A
Zero
- B
Along the diagonal $AC$
- C
Along the diagonal $BD$
- D
Perpendicular to side $AB$
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