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    $\begingroup$ Have you taken a look at the Q & A here: What, in simplest terms, is gauge invariance? $\endgroup$
    – Hal Hollis
    Commented Oct 4, 2018 at 16:54
  • $\begingroup$ @HalHollis I read: "Choosing a specific gauge (gauge fixing) can make solving a physical problem much easier than it would be if you did not fix a gauge. Normally one chooses the Coulomb gauge." I am not interested in how it simplifies the problem, can someone provide some illustration of this? A comment on the last part of my question is also appreciated. $\endgroup$
    – PhysicsMathsLove
    Commented Oct 4, 2018 at 17:00
  • $\begingroup$ As written, you question might be considered too broad. In fact, it's not quite clear what your specific question is. $\endgroup$
    – Hal Hollis
    Commented Oct 4, 2018 at 17:07
  • $\begingroup$ A choice of a particular gauge, added on to the original potential, is often likened to a change of coordinates, to solve a physical problem, as in the fact some equations are easier to solve in spherical, rather than cartesian coordinates. I would be pretty sure there is a duplicate here. $\endgroup$
    – user207480
    Commented Oct 4, 2018 at 20:13