Which one of the following is an electric conductor ?

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Which one of the following is an electric conductor ?

A plastic sheet
Distilled water
Human body
A wooden thin sheet
This question was previously asked in
UPSC CDS-1 – 2021
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An electric conductor is a material that allows electric current to flow through it easily. Plastic and wood are electrical insulators, meaning they resist the flow of electricity. Distilled water is a very poor conductor of electricity because it contains very few ions. The human body contains various salts dissolved in water, which provide ions that can carry electric charge, making the human body a conductor of electricity.
Conductors allow charge flow, insulators resist it. The presence of free charge carriers (like ions in solutions or free electrons in metals) determines conductivity.
Metals like copper and aluminum are excellent conductors. Pure water is a poor conductor; its conductivity increases significantly with dissolved impurities (salts, acids, bases) that form ions.

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