Measurement Of High Resistance by Megohm Bridge method            

The four arms of Wheatstone bridge are as follows: AB=100 Ω, BC=10 Ω, CD=4 Ω, and DA=50 Ω. The galvanometer has a resistance of 20 Ω and is connected across BD. A source of 10V d.c. is connected across AC. Find the current through the galvanometer. What should be the resistance in the arm DA for no current through the galvanometer.

Bridge circuits are used for measurement of

The four arms of Wheatstone bridge are as follows: AB=100 Ω, BC=1000 Ω, CD=4000 Ω, and DA=400 Ω. The galvanometer has a resistance of 100 Ω, a sensitivity of 100mm/uA and is connected across AC. A source of 4V d.c. is connected across BD. calculate the current through the galvanometer.