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JonJackjon t1_j9zbbfe wrote

Currents induced in a conductive material are a function of the magnetic field being imposed on the material and its electrical resistance.

Putting holes in a subject material increases the electrical resistance. Hence the resulting field will be weaker.

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Gopher_Lad OP t1_j9zgkw2 wrote

You aren't physically changing the coppers properties by cutting holes into it though. Why doesn't the field induce many smaller loops of current?

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wtfomg01 t1_ja16tt1 wrote

You're changing its structure and the field is both a function of its properties and its structure.

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