Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively [IIT-JEE (Screening) 2004]

Six charges, three positive and three negative of equal magnitude are

1.	Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively [IIT-JEE (Screening) 2004]
A.	\[+,\,-,\,+,\,-,\,-,\,+\]
B.	\[+,\,-,\,+,\,-,\,+,\,-\]
C.	Remain unchanged
D.	\[-,\,+,\,+,\,-,\,+,\,-\]
Answer» E.

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