| ASSERTION: Joule effect is irreversible, but Peltier effect is reversible. |
| REASON: On reversing the direction of current through a conductor, amount of heat produced remains the same (Joule effect). But on reversing the direction of current through a thermocouple, heat is evolved at the junction where it was absorbed (Peltier effect). |
A) If both assertion and reason are true and reason is the correct explanation of assertion
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
There is no change in joule effect on reversing the direction of the current i.e., whatever may be the direction of current always heat is evolved. While in Peliter effect, if the direction of current is reversed. Heat is absorbed at the junction where earlier heat was evolved and vice versa.
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