This post is from an earlier year, meaning the information here is likely outdated. You should look for a newer post from the current year to get the newest exercises and notes.
Finn Ravndal has written a note on the magnetic field from solenoids. In this note Finn explains how to calculate the field at different points in space around and inside the solenoid. This can come in very handy for those of you who still feel a bit unfamiliar with the concept and for those who want to learn a bit more.