Physics · GRAVITATION

Four identical particles, each of mass \( m \), are placed at the vertices of a square of side \( l \). The gravitational potential at the centre of the square is:

1. A
   \( -4\sqrt{2} \frac{G m}{l} \)
2. B
   \( -2\sqrt{2} \frac{G m}{l} \)
3. C
   \( -4 \frac{G m}{l} \)
4. D
   \( -8 \frac{G m}{l} \)