Power loss from eddy currents in copper plate between two solenoids

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Orlando
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I have an experiment in which I have two solenoids where one induces an EMF in the other. I then introduce copper plates between the two coils and measure the decrease in induced EMF in the second solenoid. How could I calculate the power loss due to eddy currents induced in one of the copper plates? What equation(s) would I need to use? I can't find any source online so please help! I am not talking about power loss due to heat, i am talking about power lost in the system of the two solenoids.
 
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