What effect would a copper ring around a current carrying conductor have on the current in the conductor? How can I go about mathematically modelling the current in the conductor?
Details : The conductor in question is a electrode roughly 2 meters in diameter. It slides into the copper ring roughly the same diameter but very small in length compared to the electrode and is therefore a ring as you stated and not a tube. By half efficiency I mean the current in the electrode is much less than what it normally runs at. The ring was originally stainless steel and was then replaced by this copper version. After this and some other changes the decrease in current was noticed. It was suspected that the copper is having some form of coupling effect or transformer action with the electrode thus limiting the current. The ring was then divided into 6 parts and rejoined this time insulted from one another inhibiting current flow in this ring. The reduced current was still observed in the electrode. This to me is a pretty clear indication that the copper ring in fact has no effect and I merely want to confirm this hypothesis. I'm assuming capacitive effects are not of a concern either as the ring is small compared to the conductor and the AC power supplied to the electrode is of low frequency. Another observation that is convincing me that the copper is having no effect is that if a transformer action or some form of coupling was occurring between the electrode and the copper, the current induced in the copper would definitely be visible in the form of temperature because at such high currents, even with low resistance, the heat in the copper should be very high.(I2R). Would you agree with this?