Question

If F1 is the magnitude of the force exerted

Answer 1

Answer: 3. F1 = F2

Explanation:

According to Newton's law of Gravitation, the force $F$ exerted between two bodies or objects of masses $M$ and $m$ and separated by a distance $r$ is equal to the product of their masses divided by the square of the distance:  

$F=G\frac{Mm}{r^2}$ (1)

Where $G$is the gravitational constant

Now, in the especific case of the Earth and the satellite, where the Earth has a mass $M$ and satellite a mass $m$, being both separated a distance $r$, the force exerted  by the Earth on the satellite is:

$F1=G\frac{Mm}{r^2}$   (2)

And the force  exerted by the satellite on the Earth is:

$F2=G\frac{Mm}{r^2}$   (3)

As we can see equations (2) and (3) are equal, hence the magnitude of the gravitational force is the same for both:

$F1=F2$