The potentiometer wire AB shown in figure is 50cm long. When AD = 30cm, no deflection occurs in the galvanometer. Find R

Q. The potentiometer wire AB shown in figure is 50cm long. When AD = 30cm, no deflection occurs in the galvanometer. Find R

(a) 3Ω

(b) 3.5Ω

(c) 4Ω

(d)2.5Ω

Ans: (c)

Sol:

30/20 = 6/R

⇒ R = 4 ohm