A mild steel bar is in three parts, each 20 cm long. The diameters of parts AB, BC and CD are 2 cm, 1 cm and 3 cm respectively. The bar is subjected to an axial pull of 4t as shown in the given figure. If E = 2 x 106 kg/cm2 and the elongations in the three parts of the bar are 1, 2 and 3 respectively, then the ratio of the greatest to the least of these elongations will be

A mild steel bar is in three parts, each 20 cm long. The diameters of

1.	A mild steel bar is in three parts, each 20 cm long. The diameters of parts AB, BC and CD are 2 cm, 1 cm and 3 cm respectively. The bar is subjected to an axial pull of 4t as shown in the given figure. If E = 2 x 106 kg/cm2 and the elongations in the three parts of the bar are 1, 2 and 3 respectively, then the ratio of the greatest to the least of these elongations will be
A.	9
B.	4
C.	3
D.	2
Answer» D. 2