Meter Bridge
In a meter bridge a resistance of R Ω and a shunt resistance S Ω are connected as shown, the null point is found to be at 40cm from A If a 12 Ω resistor is connected in parallel with S the null point changes to 50cm Find R and S. 1 st case R / 40=S / 60 R=2S/3 --------------- (1) 2 nd case R / 50= [12S / (12+S)] / 50 (12 Ω and S Ω are connected in parallel ) ie R=12S / (12+S) ---------------(2) solving (1) and (2) S=6 Ω and R=4 Ω