Physics
A voltaic cell converts chemical energy to

Electrical energy
Mechanical energy
Heat energy
Light energy

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Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
Whose resistance falls almost to zero at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts behaves like insulating media
No radiation of heat takes place
Air layer between two shirts works as good conductor
Two thin shirts become thicker so prevent transmission of heat

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