Q. Two wires having resistance of $2\Omega$ and $4\Omega$ are connected to same voltage. Ratio of heat dissipated at resistance is
A) 1 :2
B) 4 :3
C) 2 :1
D) 5 :2
Explanation
(c) $H = \frac{V^{2}}{R}t \Rightarrow \frac{H_{1}}{H_{2}} = \frac{R_{2}}{R_{1}} = \frac{4}{2} = \frac{2}{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.