Question

Three particles each of mas are kept at vertical vertex of equilateral triangle of side l the gravitational field at centre due to this particle is

Answer 1

Let ABC be the triangle.

Let mass m be situated at the midpoint of side BC.

It experiences equal and opposite force due to particle at B and C

Hence the total force experienced by the mass is only due to A

Which equal to Gm^2/(a×sqrt(3)/4))^2

4Gm^2/3a^2