Student A calculates the force as 9.0 N. Student B calculates the force as 0.25 N. Which student is correct and why?

1/0.14nm = 10^10/1.4 a lot

root word, prefixes, and suffixes

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach