Explain the energy changes involved when a positive charge moves because of a nearby, negatively charged object. use the terms electrical potential energy, work, and kinetic energy in your answer.]

Work done by the electrostatic force will be positive

Kinetic energy of two charges will increase

Electrostatic potential energy will decrease

Explanation:

Electrostatic potential energy of system of two charges is given as

here we know that

= two charges between which interaction is required

r = distance between two charges

now if it is given that a positive charge is moved due to nearby negative charge

so since we know that negative charge will attracted towards to positive charge due to mutual attraction force between them

so here the force of attraction between them will do positive work to move the two charges near to each other

This work done will increase the kinetic energy of the system of two charges

Since there is no external force on the system of two charges so total mechanical energy will remain conserved and hence we can say if kinetic energy is increasing so electrostatic potential energy will decrease for this system

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.

hope this !

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.

the higher the current the higher the mag field around it the higher the influence on the compass