Q. The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is
A) 0.2 Ω
B) 0.5 Ω
C) 0.8 Ω
D) 1.0 Ω
Explanation
[Solution from source] I = E/(R + r): 0.2 = 2.1/(10 + r), so 10 + r = 10.5 and r = 0.5 Ω. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.