MCQ
A $3\,^oC$ rise in temperature is observed in a conductor by passing a certain current. When the current is doubled, the rise in temperature will be ............. $^oC$
- A$15$
- ✓$12$
- C$9$
- D$3$
✓
Answer
Correct option: B.
$12$
b
${i^2}Rt = C\theta = 3\,C;$ $C =$ Thermal capacity
${i^2}Rt = C\theta = 3\,C;$ $C =$ Thermal capacity
when ${i_1} = 2i \Rightarrow C{\theta _1} = 4{i^2}Rt = 4 \times 3\,C \Rightarrow {\theta _1} = 12\,^oC$
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