A) \[0.25\,\,\Omega \]
B) \[0.4\,\,\Omega \]
C) \[0.5\,\,\Omega \]
D) \[4\,\,\Omega \]
Correct Answer: A
Solution :
[a] Let unknown resistance be X. |
Then condition of Wheatstone's bridge gives, \[\frac{X}{R}=\frac{20\,r}{80\,r}\] |
Hence, unknown resistance is |
\[X=\frac{20}{80}\times R=\frac{1}{4}\times 1\] \[(\because \,R=1\,\Omega )\] |
\[=0.25\,\Omega \] |
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