What is the gravitational force between mars and Phobos

Explanation:

We have,

Mass of Mars is,

Mass of its moon Phobos,

Distance between Mars and Phobos, d = 9378 km

It is required to find the gravitational force between Mars and Phobos. The force between two masses is given by

Plugging all values, we get :

So, the gravitational force is .

c) up is the direction the magnetic force is acting on the charge.

i think the answer is a, hope this : )