Question Detail

PHY 102 Test Compilation PHY 102 4 Objective Question

Question

Two identical batteries, each emf 18V, internal resistance 1Ω, in parallel, across 4Ω resistor. Current in resistor?
Options
A 1.0 A
B 2.0 A
C 4.0 A
Correct Answer
D 3.6 A
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.

Question Info