A) \[2.5\Omega \]
B) \[2.0\Omega \]
C) \[1.54\Omega \]
D) \[1.0\Omega \]
Correct Answer: C
Solution :
For a potentiometer, the internal resistance \[(r)\] is given by \[r=R\left( \frac{{{l}_{1}}}{{{l}_{2}}}-1 \right)\] Given, \[R=10\Omega ,\,\,{{l}_{1}}=75\,\,cm,\,\,{{l}_{2}}=65\,\,cm\] \[\therefore \] \[r=10\left( \frac{75}{65}-1 \right)=10\times 0.154=1.54\Omega \]You need to login to perform this action.
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