Required information:

A helical compression spring is to be made of oil$-$tempered wire, d$,$ of diameter $1\mathrm{.}1-$ mm with a spring index of C$=11.$ The spring is to operate inside a hole, so buckling is not a problem and the ends can be left plain. The free length of the spring, L$,$ should be $75$ mm $.$ A force of $50$ N should deflect the spring $15$ mm $.$

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

QUESTIONS: Determine the spring rate and the minimum hole diameter for the spring to operate in$.$

The spring rate should be $\_\_\_\_\_\_$N$//$mm$.$

The minimum hole diameter should be $\_\_\_\_\_$mm$.$