Q. What is the ratio of heat generated in $R$ and $2R$
A) 2 :1
B) 1 :2
C) 4 :1
D) 1 :4
Explanation
(a) Both $R$ and $2R$ are in parallel [$V -$ constant]
So using$\ P = \frac{V^{2}}{R} \Rightarrow \frac{P_{1}}{P_{2}} = \frac{R_{2}}{R_{1}} \Rightarrow \frac{H_{1}}{H_{2}} = \frac{R_{2}}{R_{1}} = \frac{2}{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.