A proton circulates in a cyclotron, beginning approximately at rest at the center. Whenever it passes through the gap between dees, the electric potential difference between the dees is 290 V. (a) By how much does its kinetic energy increase with each passage through the gap(b) What is its kinetic energy as it completes 20 passes through the gap?
2 keV
(c) Let r20 be theradius of its circular path in the dee that it enters as itcompletes those 20 passes, and letr21 be its nextradius, as it enters a dee the next time. By what percentage doesthe radius increase when it changes fromr20 tor21?(r21 -r20) /r20%)
3%

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.

increase masses, decrease separation

magnets not strong enough

explanation: