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Charges are placed on the vertices of a ...

Charges are placed on the vertices of a square as shown

Let `vecE` 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

(a) `vecE` changes, V remains unchanged

B

(b) `vecE` remains unchanged, V changes

C

(c) both `vecE` and V changes

D

(d) `vecE` and V remain unchanged

Text Solution

Verified by Experts

The correct Answer is:
A
As shown in the figure, the resultant electric fields before and after interchanging the charges will have the same magnitude, but opposite directions. Also, the potential will be same in both cases at it is a scalar quantity.
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