Small magnets show the magnetic field lines (yellow line in the picture below) 
To Do or Not To Do
- Hey, Professor! When you were saying that there was homework, did you mean that we had to do it?
I needed a moment to comprehend that question.
Dear Student, I designed and posted the HW assignment just because I like to post something from time to time and apparently I did not have anything better to do yesterday.
Relativity of Time
Where physics meets philosophy... There is another view on the relativity of time:
Growing older is mandatory.
Growing up is optional.Just a thought dedicated to my students.
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