A) 0.10
B) 0.50
C) 10
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 \[3=\frac{7+r}{2+r}\] Putting in Eq. (i), we get \[X=30\,\Omega \]
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