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Charges are placed at the vertices of a square as shown in the diagram . If charges at A and B are interchanged with C and D respectively , then,

A

only magnitude of electric field will change at the centre

B

both magnitude and direction of electric field will change at the centre

C

only direction of electric field at centre will change

D

both magnitude and direction of electric field will remain unchanged

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The correct Answer is:
C
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