Physics
Due to temperature variation along a conductor, potential variation occurs along it. This phenomenon is known as

Seebeck effect
Joule effect
Peltier effect
Thomson effect

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

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