Answer :


Concepts/Formula used:


Wheatstone bridge:



The condition for no deflection through the galvanometer is



Here, and



Let the potentiometer wire be at l cm from A when there is no deflection through galvanometer.


Let the resistance per cm of the potentiometer wire be be ρ .


Hence, and .


Using the equation when there is no deflection for a Wheatstone bridge/potentiometer, we have








Hence, the free end of the galvanometer must be 16cm from point A.


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