In an experiment, a physicist doubles the original distance between two charged particles. What happens to the ratio of the gravitational force to the electrostatic force between the two particles after the distance between them is doubled?

•Like the charges, they were denied. Unlike withdrawing a commission. ... The force depends on the square of the distance between the two return charges. Thus, when the distance between two charges is doubled, the force of attraction or repulsion weakens and decreases to 1/4 of the original value.

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.