Question

A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of emf's is:(a) 5 : 1(b) 5 : 4(c) 3 : 4(d) 3 : 2

Answer 1

it is the correct answer

Answer 2

Answer:

d) 3 : 2

Explanation:

Length of wire = 100cm (Given)

Balance points from positive end = 50 and 10 (Given)

The emf of the cell is directly proportional to the balancing length. Thus,

In series - E1 + E2 = K(50)

In parallel -E1 - E2 = K(10)

= E1 + E2 / E1 - E2 = 50/10

= E1/E2 = 5+1/5-1

=  E1/E2 = 6/4

= E1/E2= 3/2

Thus, the emf's are in the ratio of 3:2.