question_answer

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)                    \[E=0,\,V\ne 0\]

Correct Answer: A

Solution :

                     At centre E = 0 and V = 0