Q. A current of $2\ A$ passing through conductor produces $80\ J$ of heat in $10\ seconds.$ The resistance of the conductor is
A) $0.5\ \Omega$
B) $2\ \Omega$
C) $4\ \Omega$
D) $20\ \Omega$
Explanation
(b) $H = i^{2}Rt \Rightarrow R = \frac{H}{i^{2}t} = \frac{80}{4 \times 10} = 2\ \Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.