A) \[0.1\Omega \]
B) \[0.5\Omega \]
C) \[1\Omega \]
D) \[zero\]
Correct Answer: B
Solution :
\[i=\frac{E}{R+r}\] or \[\frac{{{i}_{1}}}{{{i}_{2}}}=\frac{{{R}_{2}}+r}{{{R}_{1}}+r}\] \[\therefore \] \[\frac{0.9}{0.3}=\frac{7+r}{2+r}\] or \[\frac{7+r}{2+r}\] or \[r=0.5\Omega \]
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