A) \[1/3\,\,\Omega \]
B) \[1/4\,\,\Omega \]
C) \[1\,\Omega \]
D) \[0.5\,\Omega \]
Correct Answer: A
Solution :
Current \[i=\frac{E}{R+r}\] \[2=\frac{E}{2+r}\] ?(i) \[0.5=\frac{E}{9+r}\] ?(ii) From Eqs. (i) and (ii), We have \[=\frac{2}{0.5}=\frac{9+r}{2+r}\] \[4=\frac{9+r}{2+r}\] \[3r=1\] \[r=\frac{1}{3}\Omega \]You need to login to perform this action.
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