MCQ
Work done by restoring force in a string within elastic limit is $-10 \,J$. Maximum amount of heat produced in the string is .......... $J$
- ✓$10$
- B$20$
- C$5$
- D$15$
✓
Answer
Correct option: A.
$10$
a
(a)
(a)
Within elastic limit there is no loss of energy in deforming because no permanent deformation.
$\therefore$ We can say
Work done by external force $=$ heat produced
Or (-)ve of work done by restoring force $=$ heat produced
$-1 \times-10 \,J =\Delta H$
$10 \,J =\Delta H$
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