Physics
A good conductor while carrying current is

Positively charged
Negatively charged
Alternately charged positive and negative
Electrically neutral

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of mercury is greater than its adhesion with glass.
density of mercury is greater than that of water.
mercury is a metal.
cohesion of water is greater than its adhesion with glass.

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