The emf E = 20 V, r = 2 Ω, E’ = 4 V, R = 3 Ω, AB = 100 cm and resistance per unit length of potentiometer wire AB is 2 Ω/m. find the null point length AJ in the given below circuit diagram of a potentiometer.
1
80 cm
2
60 cm
3
40 cm
4
20 cm
The emf E = 20 V, r = 2 Ω, E’ = 4 V, R = 3 Ω, AB = 100 cm and resistance per unit length of potentiometer wire AB is 2 Ω/m. find the null point length AJ in the given below circuit diagram of a potentiometer.