2021 (source code)
= 2021
{scope}
{title2=A13481W1}
Source: https://www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/9/Physics%20Papers%202020.pdf?cookie_passthrough=1
Source bundle pages 70–73; the cover identifies Trinity Term 2021 despite the attachment filename. Use coordinates $x^\mu=(ct,x,y,z)$, <metric signature> $(-,+,+,+)$, and $A^\mu=(\phi/c,\mathbf A)$. For the <electromagnetic field tensor> use $F^{0i}=E_i/c$ and $F^{ij}=\epsilon_{ijk}B_k$. Prescribed external fields are treated classically, neglecting <radiation reaction> in the trajectories; <radiation> losses are computed separately where requested.
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