2019 (source code)
= 2019
{scope}
{title2=A13485W1}
{title2=B6}
Source paper: https://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>.
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