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02-01-2024
Physics

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σ₁ and σ₂ are the electrical conductivities of Ge and Na respectively. If these substances are heated, then

A. Both σ₁ and σ₂ increase
B. σ₁ increases and σ₂ decrease
C. σ₁ decreases and σ₂ increases
D. Both σ₁ and σ₂ decrease

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