Question

Negative Thomson effect is observed in

choose

nickel

zinc

silver

copper

​

Answer 1

The materials like Cu, Ag, Zn, Sb, Cd shows the positive Thomson effect i.e. when terminals of battery are connected across material with positive terminal at hot end and negative terminal at cold end the heat is evolved. When the polarity of battery is reversed the heat is absorbed.

Also, the materials like Fe, Co, Ni, Bi, Pt shows the negative Thomson effect i.e. when terminals of battery are connected across material with positive terminal at hot end and negative terminal at cold end the heat is absorbed. When the polarity of battery is reversed the heat is evolved.

When Pb material is used, irrespective of the polarity of the battery no heat is evolved or absorbed (practically). Hence, no Thomson effect will occur across Pb material. 

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Answer 2

Answer:

nickel

Explanation:

the materials like Fe, Co, Ni, Bi, Pt shows the negative Thomson effect i.e. when terminals of battery are connected across material with positive terminal at hot end and negative terminal at cold end the heat is absorbed. When the polarity of battery is reversed the heat is evolved.

When Pb material is used, irrespective of the polarity of the battery no heat is evolved or absorbed (practically). Hence, no Thomson effect will occur across Pb material.

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