Selena drew a diagram to show how current moves in a loop of wire that is placed between two magnets. which best explains how selena can correct her error? she can change the magnets so like poles are facing each other. she can change the arrows so they show current traveling in opposite directions on the sides of the loop. she can change the arrows so they show the magnetic field reversing direction between the magnets. she can change the magnetic poles so they are both on one side of the loop.

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.