Counterwinding
The heating coils of an electric clothes dryer can be counter-wound so that their magnetic fields cancel one another, greatly reducing the mutual inductance with the case of the dryer.
Source
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"OpenStax College, College Physics. January 8, 2013."
http://cnx.org/content/m42420/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.