From: PointedEars@web.de   
      
   Kuan Peng wrote:   
   > Le 21/01/2026 à 08:29, Thomas 'PointedEars' Lahn a écrit :   
   >>> If at the beginning the current in A is constant,   
   >>   
   >> What exactly do you mean by that?   
      
   You have not answered my question.   
      
   >>> do you think that there is a current in the coil B?   
   >>   
   >> Unless coil B is in the vicinity of a voltage source, or if the external   
   >> electric field is not constant, then there should not be:   
   >   
   > We discuss the phenomenon in ideal condition with no field other than   
   > those from A and B.   
      
   Technically, the fields are not "from A and B", but exist in all of   
   spacetime, and just have different values at different locations and   
   times; but OK.   
      
   > If you agree that   
   > 1.	When the current in A is constant, the induced voltage and current in B   
   > are zero.   
      
   I agree provisionally: *voltages* are _never_ induced, _currents_ are, due   
   to electric fields.   
      
   > Then,   
   > 2.	When the current in B is constant, the induced voltage and current in A   
   > are zero.   
      
   Same as above.   
      
   > 3.	If the current in B is induced by the current in A, the current in B is   
   > constant.   
   > Then, the voltage and current in A induced by the current in B   
   > are zero, which is our case 2.   
      
   I disagree with both statements because of Lenz's Law.   
      
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   PointedEars   
      
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