GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a bad conductor of heat as well as electricity
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a good conductor of heat as well as electricity
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a good conductor of heat but a bad conductor of electricity
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a bad conductor of heat but a good conductor of electricity
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Detailed explanation-1: -The correct answer is Only b. Mica is used in the iron for pressing clothes since Mica is a good conductor of heat. Mica is a bad conductor of electricity and can endure high temperatures. They are heat tolerant, insulating and dielectric.
Detailed explanation-2: -So mica has good thermal conductivity due to phonons, but doesn’t have sufficient free electrons to be a good conductor of electricity.
Detailed explanation-3: -They are heat tolerant, insulating and dielectric. Because of these properties, they are used in electrical appliances. They are used in control devices, heating devices, neon lights and other lighting equipment.
Detailed explanation-4: -Hence, the insulator used in the element of an electric iron is mica.
Detailed explanation-5: -Mica is one of the materials used in electrical engineering that can be found in many electric motors, generators and transformers.