Question

Four equal masses, m each are placed at the corners of a square of length (l) as shown in the figure

Answer 1

0

Answer 2

The four equal masses are placed symmetrically at the corners of a square. Due to this symmetry, the gravitational fields produced by masses at opposite corners at the center are equal in magnitude and opposite in direction, thus cancelling each other out. The net gravitational field at the center is therefore zero.