Question

A spherically symmetric gravitational system of particles has a mass density $\rho = \begin{cases} \rho_0 & \text{for} \; r \le R \\\ 0 & \text{for} \; r > R \end{cases}$ where $r_0$ is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed $V$ as a function of distance $r (0 < r < \infty)$ from the centre of the system is represented by

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Answer 2

Answer (d)