Consider the statements A and B in the previous question. Peltier effect is caused 

(A) Free-electron density is different in different metals.
(B) Free electron density in a metal depends on temperature.

(a) due to both A and B 

(b) due to A but not due to B 

(c) due to B but not due to A 

(d) neither due to A nor due to B.

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(b) due to A but not due to B

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