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

Joule effect
Peltier effect
Thomson effect
Seebeck effect

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them

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