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Charges are placed on the vertices of a square as shown. Let $E$ be the electric field and $V$ the potential at the centre. If the charges on $A$ and $B$ are interchanged with those on $D$ and $C$ respectively, then 
  • A$\overrightarrow E$ remains unchanged, $V$ changes
  • BBoth $\overrightarrow E$ and $V$ change
  • C$\overrightarrow E$ and $V$ remains unchanged
  • D$\overrightarrow E$ changes, $V$ remains unchanged
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