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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