Q. A $3℃$ rise in temperature is observed in a conductor by passing certain current. When the current is doubled, the rise in temperature will be
A) $15℃$
B) $12℃$
C) $9℃$
D) $3℃$
Explanation
(b) $i^{2}Rt = C\theta = 3C;C =$ Thermal capacity
when$\ i_{1} = 2i \Rightarrow C\theta_{1} = 4i^{2}Rt = 4 \times 3C \Rightarrow \theta_{1} = 12℃$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.