Moment of Inertia
A heavy wheel called flywheel is attached to the shaft of steam engine, automobile engine etc., because of its large moment of inertia, the flywheel opposes the sudden increase or decrease of the speed of the vehicle. It allows a gradual change in the speed and prevents jerky motion and hence ensure smooth ride of passengers.
A circular disc is to be made by using iron and aluminium, so that it acquires maximum moment of inertia about its geometrical axis. It is possible with
Options:
(a) iron and aluminium layers in alternate order
(b) aluminium at interior and iron surrounding it
(c) iron at interior and aluminium surrounding it
(d) Either ( a) or ( c)