A) \[1\,\Omega \]
B) \[0.25\,\Omega \]
C) \[0.5\,\Omega \]
D) \[5\,\Omega \]
Correct Answer: B
Solution :
[b] \[R=\frac{\Delta V}{\Delta I}=\frac{2.1-2}{(800-400)\times {{10}^{-3}}}=\frac{1}{4}=0.25\Omega \]
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