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Q 1288112907.     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 charge is possible for, P, Q, R, S, T and U respectively ?

A

+ , - , + , - , - , +

B

- , + , + , - , + , -

C

+ , + , - , + , - , -

D

+ , - , + , - , + , -

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