Satellites - Orbital Velocity & Period question from JEE Main 2021 (24 Feb, Shift 1)

Answer: (d)

1. For four equal masses on a circle: $v = \frac{1}{2}\sqrt{\frac{GM}{R}(1+2\sqrt{2})}$ (net pull $\frac{GM^2}{4R^2}(1+2\sqrt{2})$).
2. Put $M = 1$ kg, $R = 1$ m.
3. So the answer is (d) $\frac{1}{2}\sqrt{G(1+2\sqrt{2})}$.