In the figure a long uniform potentiometer wire AB is having a constant potential gradient along its length. The null points for the two primary cells of emfs E 1 and E 2 connected in the manner shown are obtained at a distance of 120 em and 300 em from the end A. Find (i) E 1 /E 2 and (ii) position of null point for the cell E 1 . How is the sensitivity of a potentiometer increased? drAW the figure also

sudhanshu , 10 Years ago

Grade 12