Question Detail
Question
Two identical batteries, each emf 18V, internal resistance 1Ω, in parallel, across 4Ω resistor. Current in resistor?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Parallel batteries: equivalent emf = 18V, equivalent internal resistance = 1/2 = 0.5Ω. Total R = 4 + 0.5 = 4.5Ω. I = 18/4.5 = 4.0 A.
Hint
Parallel batteries: same E, r/2.