In the primary circuit of potentiometer the rheostat can be varied from 0 to \( 10 \Omega \). In...

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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)
(i) Find the length \( A P \) of the wire such that the galvanometer shows zero deflection.
(ii) Now the rheostat is put at maximum resistance \( (10 \Omega) \) and the switch \( S \) is closed. New balancing length is found to be \( 8 \mathrm{~m} \). Find the internal resistance \( r \) of the \( 4.5 \mathrm{~V} \) cell.
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