Question

in a potentiometer arrangement is cell of EMF 1.25 volt gives balance point at 35 cm length of the wire if the sale is replaced by another cell and the balance. Shifted to 63 cm what is the EMF of the second sale

Answer 1

Solution :

E1l2=E2l2

given E1=1.25V

l1=35cm

and l2=63cm

While using a potentiometer , the potential grading remains constant .

(ie) Eαl

(ie) E1E2=l1l2

(ie) 1.25E=3563

=> E=1.25×6335

=2.25V

Answer 2

The answer is 2.25 v ......
hope this will help you...