Im stuck on these last few questions from my physics assignment.?

Posted on 2017-03-16 18:32:00 in Physics by NICK GRAY

A) Phobos is a moon of Mars. Calculate the magnitude and the direction of the gravitational field of Phobos on its surface. Then, find the magnitude and direction of Mars’ gravitational field at the surface of Phobos. What is the magnitude and direction of the net gravitational field? 

B) Imagine three charges arranged equally spaced on a circle. Determine the expression for the electric field vector in the centre of the circle. 

C) Set up a situation where the gravitational attraction between two objects is just balanced by the electrostatic repulsion. At what distance will these force be equal and opposite? 

D) Consider three charges (two positive and one negative) arranged on a line. Derive the relationships between the charges and their locations so that the net force on each charge is zero. You will have three equations, one each from setting the force equal to zero on each charge. 

Any help would be greatly appreciated.

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