An iron strip AC and a copper strip AB are connected together at A . The junction A is kept at 0^ ^ ^ C , while the free ends B and C are held at 100^ ^ ^ C . A potential difference exists between

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Quantrex Academy · Accepted Answer

Correct answer: D. the two ends of the iron strip

Due to the Seebeck effect, a potential difference (thermo-emf) exists between the free ends

B

and

C

of the two dissimilar metals (iron and copper) because the junction

A

is at

0^{{}^{{}^{\circ}}}C

and the free ends are at

100^{{}^{{}^{\circ}}}C

.

Due to the Thomson effect, a potential difference exists across the ends of a single conductor if there is a temperature gradient along its length. Since end

A

is at

0^{{}^{{}^{\circ}}}C

and ends

B

and

C

are at

100^{{}^{{}^{\circ}}}C

, a potential difference exists between the two ends of the copper strip (

A

and

B

) and between the two ends of the iron strip (

A

and

C

).

No potential difference exists between two locations on the same metal if they are at the same temperature.

An iron strip AC and a copper strip AB are connected together at A...

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