You have given a power supply, copper wire, and an iron nail. What should you do to decrease the strength of the electro magnet? Question 5 options:

Increase the current from the power supply and add the iron nail because as current increases magnetic field also increases( both are directly proportional)

Decrease the current from the power supply because as current decreases magnetic field also decreases ( both are directly proportional)

Decrease the current because magnetic field and current are inversely proportional.

Increase the current, and add the iron nail.

Explanation:

If you wrap some of the wire around the nail in one direction and some of the wire in the other direction, the magnetic fields from the different sections fight each other and cancel out, reducing the strength of your magnet

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.