автор: Nguyen D L•
11 авг. 2021 г.
Thank you so much Professor Hafner,
Your physics demo give me deeper insight into Electric Field. I am sure other student would learn and love your class. I am more confident to tutor my son in Electricity portion of E&M now.
автор: Muhammad E•
10 февр. 2022 г.
on of the best tutor i learned from him alot of simplicity in explanation the idea ♥
автор: David W•
25 февр. 2022 г.
Too many mistakes in the problems.