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Sherlock-Holmie t1_jba9ut5 wrote

From one pic I’ve seen, it seems that the cover is pretty much on top of the coils.

The mutual inductance change ratio it does will be (r_initial/r_final)^2 If the towel is the same thickness as the cover, this’ll be r_final=2*r_initial (1/2)^2=1/4 whichll mean 1/4 the power

If the cloth is half the thickness of the cover, then r_final=1.5*r_initial (1/1.5)^2=.44

If the cloth is 1/8th the thickness, it’ll be 80% the same efficiency

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