1.

Four charges \[+Q,\,-Q,\,+Q,\,-Q\] are placed at the corners of a square taken in order. At the centre of the square                                                                                              [RPMT 2003]

A.                    \[E=0,\,V=0\]
B.                                      \[E=0,\,V\ne 0\]
C.                    \[E\ne 0,\,V=0\]
D.                    \[E=0,\,V\ne 0\]
Answer» B.                                      \[E=0,\,V\ne 0\]


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