The induced voltage in the loop rises proportional with the frequency. The inductive reactance rises also proportional with the frequency. Both compensate each other what, in shortcut mode, results in a constant current versus frequency. The ohmic resistance of the loop including the skin effect is rather small with relation to XL, that that it has little influence on the shortcut current. A loop connected to a real amplifier with Zin = >2 Ohms even more reduces the impact of the loop resistance on the loop current.
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regards
Fred
