A cell of e.m.f. 4 V and of negligible internal resistance is connected in series with a potentiometer wire of length 400 cm. The e.m.f. of a Leelanche cell is found to be balacned at 150 cm from the positive end of the potentiometer wire. What is the e.m.f. of the Leclanche cell ?

Options

A. 1 V
B. 1.5 V
C. 2 V
D. 2.5 V

Answer

B

Explanation

`(V)/(E )=(l)/(L) therefore V=(150)/(400)xx4 V= 1.5 V`