A constant torque acting on a uniform circular wheel change its angular momentum from A0 to 4 A0 in 4 seconds. The magnitude of this torque is

Q: A constant torque acting on a uniform circular wheel change its angular momentum from A0 to 4 A0 in 4 seconds. The magnitude of this torque is

(a) 3 A0/4

(b) A0

(c) 4 A0

(d) 12 A0

Ans: (a)