Question

Two stars of equal mass M are in orbit around one another. They are a distance R apart. What is the gravitational field strength at the point A, midway between them?

(a) GM/R^2

(b) zero

(c) 2GM/R^2

(d) 4GM/R^2

Answer 1

$$g(R)=\frac{GM}{R^2}-\frac{GM}{R^2}=0$$

Answer: (b) zero