A) \[100\,\,\Omega \]
B) \[50\,\,\Omega \]
C) \[200\,\,\Omega \]
D) \[250\,\,\Omega \]
Correct Answer: C
Solution :
\[R=\frac{\Delta V}{\Delta l}\] \[\Delta V=0.7-0.5\,V\] \[\Delta l=1\times {{10}^{-3}}\,A\] \[\therefore \] \[R=\frac{0.7-0.5}{1\times {{10}^{-3}}}=200\,\,\Omega \]
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