Two stars of mass m1 and m2 are parts of a binary system. The radii of their orbits are r1 and r2 respectively, measured from the C.M. of the system. The magnitude of gravitation force m1 exerts on m2 is

Q: Two stars of mass m1 and m2 are parts of a binary system. The radii of their orbits are r1 and r2 respectively, measured from the C.M. of the system. The magnitude of gravitation force m1 exerts on m2 is

(a) $\frac{m_1 m_2 G}{(r_1 + r_2)^2}$

(b) $\frac{m_1 G}{(r_1 + r_2)^2}$

(c) $\frac{m_2 G}{(r_1 + r_2)^2}$

(d) $\frac{(m_1 + m_2 )}{(r_1 + r_2)^2}$

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Ans: (a)