Discussion
Which test checks coil primary resistance?
Answer: B
Primary resistance is a fraction of an ohm to a few ohms between the two small terminals. Measuring to the tower gives the secondary resistance, which makes the second option a real measurement of the other winding. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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