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 \[3=\frac{7+r}{2+r}\] or \[r=0.5\,\Omega \]You need to login to perform this action.
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