Question

39. With a potentiometer, null points are
obtained at 140 cm and 180 cm with cells
of e.m.f. 1.1 V and one of the unknown
e.m.f.respectively. The unknown e.m.f.is
(i) 1.1 V
(ii) 1.8 V
(in) 141 V (iv) 1.6 V​

Answer 1

Answer:

(i) 1.1 V because e.m.f are equal in potentiometer null