Three bodies each of mass.m. are placed at the three corners of a square of side .a.. The gravitational force on unit mass kept at the fourth corner is:

Three bodies each of mass.m. are placed at the three corners of a squa

1.	Three bodies each of mass.m. are placed at the three corners of a square of side .a.. The gravitational force on unit mass kept at the fourth corner is:
Answer» `(GM)/(3a^(2))` `(Gm)/(SQRT(3)a^(2))` `(3Gm)/a^(2)` `(Gm)/a^(2)(sqrt(2) + 1/2)` ANSWER :D