A) \[0.25\Omega \]
B) \[0.5\Omega \]
C) \[0.75\Omega \]
D) \[1.25\Omega \]
Correct Answer: B
Solution :
[b] \[r=\frac{{{\ell }_{1}}-{{\ell }_{2}}}{{{\ell }_{2}}}\times R\Omega \] Here, \[{{\ell }_{1}}=125cm,{{\ell }_{2}}=100cm,R=2\Omega .\] \[\therefore r=0.5\Omega \]
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