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 D on D and C respectively, then
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a
Both E→and V change.
b
E→and V remain unchanged.
c
E→changes, V remains unchanged.
d
E→ remains unchanged, V changes.
answer is C.
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Detailed Solution
V remains unchanged. Because with the change in position of charges, distances AO→,BO,CO and DO remains same. The direction of E changes.