2.0\(\Omega\).
3.0\(\Omega\).
5.0\(\Omega\).
6.0\(\Omega\).
Correct answer is A
\(\frac{V}{R} = \frac{E}{R + r}\)
\(\frac{0.9}{3} = \frac{1.5}{3 + r}\)
r = 2\(\Omega\).
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