Which law states that that the direction of the induced current is such that the magnetic field resulting from the induced current opposes the change in the field that caused the induced current?

Lenz Law

Explanation:

As per Lenz's law we know that direction of induced current is such that the magnetic field resulting from the induced current opposes the change in the field that caused the induced current.

This law is based upon the energy conservation principle as when magnetic field linked with the closed conducting loop changes then the work done to change the magnetic flux is used to induced the current and electrical energy in the closed loop.

As we know that when magnetic flux linked with the closed loop increases then the induced current in the loop will try to decrease the magnetic flux in such a way that its induced current will induce its magnetic field in opposite direction. And similarly if the flux linked with the closed loop decreases then induced current will increase the flux by inducing the magnetic field in the same direction

i would think form in reponse to tensional forces

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.