A) 1.2\[\Omega \]
B) 2.0\[\Omega \]
C) 0.5\[\Omega \]
D) 1.0\[\Omega \]
Correct Answer: C
Solution :
\[{{i}_{1}}=0.9amp.\] \[{{R}_{1}}=2\Omega \] \[E={{i}_{1}}{{R}_{1}}+{{i}_{1}}r\] ?(i) \[{{R}_{2}}=7\Omega {{i}_{2}}=0.3amp\] \[E={{i}_{2}}{{R}_{2}}+r{{i}_{2}}\] \[E=0.3\times 7+0.3r\] ?(ii) eq.(i) is equal to eq. (ii) \[0.9\times 2+0.9r=0.3\times 7+9.3r\] \[0.6r=2.1-1.8\] \[r=\frac{0.3}{0.6}\] \[=0.5\Omega \]You need to login to perform this action.
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