In the primary circuit of potentiometer the rheostat can be varied ...

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In the primary circuit of potentiometer the rheostat can be varied from 0 to \( 10 \Omega \). Initially it is at minimum resistance (zero).
\( \mathrm{P} \)
Find the length AP of the wire such that the galvanometer shows zero deflection.
Now the rheostat is put at maximum resistance \( (10 \Omega) \) and the switch \( S \) is closed. New balancing length is found to \( 8 \mathrm{~m} \). Find the internal resistancer of the \( 4.5 \mathrm{~V} \) cell.
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