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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 120

A potential difference develops in a conductor due to a temperature difference along it. This phenomenon is called:

  1. Joule effect
  2. Seebeck effect
  3. Peltier effect
  4. Thomson effect
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (D) Thomson effect

Explanation

The Thomson effect involves a single conductor whose ends are at different temperatures.

  • (A) Incorrect

    Wrong: heating due to current.

  • (B) Incorrect

    Wrong: needs a junction of two different metals.

  • (C) Incorrect

    Wrong: heating/cooling at a junction due to current.

  • (D) Correct

    Correct: concerns a single conductor with a temperature gradient.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.