 2019

Source paper: www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/7/Physics%20Papers%202018.pdf?cookie_passthrough=1

The cover establishes Part B, Trinity Term 2019, 13 June 2019, A13485W1; the annual bundle's 2018 filename does not determine the examination year. This is distinct from the Part C major option. All four questions are solved. Use SI magnetic susceptibility, $\chi =M/H$, and write $e>0$ for the elementary electric charge. In question 3, $n,p$ and $n_d$ are densities per area, and the band model has one parabolic extremum per carrier species with twofold spin degeneracy.