A) \[0.25\,\Omega \]
B) \[0.4\,\Omega \]
C) \[0.5\,\Omega \]
D) \[0.8\,\Omega \]
Correct Answer: A
Solution :
Here: Standard resistance of the wire \[=1\,\Omega \] Length of the wire from the left end \[l=20\text{ }cm\] The value of unknown resistance is given by \[R=\left( \frac{l}{100-l} \right)\times S\] \[=\frac{20}{100-20}\times 1=\frac{20}{80}\] \[=0.25\,\Omega \]
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