Answer :

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The Seebeck effect is a phenomenon, in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the two substances.


The cause of this voltage difference is the diffusion or migration of free electrons from a higher electron-density region to a lower electron-density region.


The free electron-density of the electrons varies from metal to metal and also electron-density changes with change in temperature.


Hence, both the statements are the causes of Seebeck Effect.

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