Question #59936
1 Answer
The best thing for this is to use E=F/Q and plug in Coulomb's Law.
So, you would find all the variables you can get (the net charge of the cube, the net charge of Q, and the distance) and plug them into the equation to solve for F.
Then, you would plug F into the equation E=F/Q, where Q= the charge of the cube, because you want to solve for its' E, the electric field.
At that point, you would fill in all the variables with actual numerical quantities, or simplify it down algebraically.
http://www.physicsclassroom.com/class/estatics/Lesson-1/Charge-Interactions
Remember, all neutral objects (eg. the cube) are attracted to charged objects. So there should be no negative numbers in this equation. It is a positive force, with a positive distance, and a positive charge.
