Question no 76 76 A simple potentiometer circuit is shown in figure The internal resistance - Physics - Current Electricity

Question

Question no 76

76 A simple potentiometer circuit is shown in figure The internal
resistance of 4 V battery is negligible AC is the uniform wire of
length 100 cm and resistance 2 â„¦ What would be
the length of AB for which galvanometer shows zero deflection

(1) 82 5 cm (2) 41 50 cm
(3) 165 cm (4) 50 cm

Shobhit Mittal · Accepted Answer

Dear Student,

the voltage across AB should be 1
5 V for the no deflection in the galvanometer 
current through the wire Ac at balanced situationI=42
4+2=0
91 Alet the length of AB be x2x100×0
91=1 5x=1501 82=82 5 ohm option 1Regards