what are insulator?
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a substance which does not readily allow the passage of heat or sound.
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Explanation: In case of heat, insulator is a substance which does not readily allow the passage of heat or sound.
In case of electricity, insulator is a a substance or device which does not conduct electricity.
In case of physics, a block of glass, ceramic, or other insulating material enclosing a wire carrying an electric current where it crosses a support.
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