76.

Two rigid bodies A and B rotate with rotational kinetic energies E_A and E_B respectively. The moments of inertia of A and B about the axis of rotation are I_A and I_B respectively. If I_A = I_B /4 and E_A = 100 E_B the ratio of angular momentum (L_A) of A to the angular momentum (L_B) of B is

(a)     25

(b)     5/4

(c)     5

(d)    1/4

Ans. c

(17)