could you please elaborate

I am not able to understand your point.

thank you @mike stone , yess i messed up my question put my question was : to find whether solenoid expands radially or not. i did some working and posted the picture for same. thanks a lot

imgur.com/a/tM7sIoI (<--- see this) why is this fact in contrary ti the fact that speed of sound is most in solids(even though density is very high)

i am studying speed of sound formula which was given by newton and corrected by laplace.. and i take temo to be same

thats right but i am taking temp. to be same .. as @alephzero said this is the reason given in my textbooks . so according to this more dense less speed and vice versa(indirectly related) ,.. so why is this not applicable in solids. solids are significantly denser than gas but velocity in solids travel faster (directly related since more density more speed of sound) i am confused