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  4. Charges are placed on the vertices of a square as shown. Let vec 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 <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/institution/3b494f29db04225c783950766df43efe-.png />

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Q. Charges are placed on the vertices of a square as shown. Let $\vec {E}$ 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
image

AIEEEAIEEE 2007Electrostatic Potential and Capacitance

Solution:

As $\vec{E}$ is a vector quantity