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In an electric iron, the coil of high re...

In an electric iron, the coil of high resistance is kept between mica sheets.

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(1) Mica is a bad conductor of electricity and good conductor of heat.
(2) In an electric iron, the coil of high resistance is kept between mica sheets so that there is no electrical contact between the coil and the heavy metal block of the iron though there is heat transfer. This protects the user from getting an electric shock.
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