A. 5.0Ω
B. 4.5Ω
C. 2.4Ω
D. 2.0Ω
E. 1.8Ω

Correct Answer:

Option A – 5.0Ω

Explanation

I = V/R=0.9/3 = 0.3

r = E/I =1.5/0.3 = 5.0Ω

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