The balance length of a potentiometer is directly proportional to the e.m.f
Thus, L1L2= E1E2\; \frac{L_1}{L_2} = \; \frac{E_1}{E_2}L2L1=E2E1
L2=L1× E2E1L_2 = L_1 \times \; \frac{E_2}{E_1}L2=L1×E1E2
L2=75× 2.2953.06L_2 = 75 \times \; \frac{2.295}{3.06}L2=75×3.062.295
= 75 x 0.750 = 56.25cm
