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On the outer rim. Further away from the axis point.
There are actually 3 kinds of inertia. They are as follows :
1. Inertia of Rest
2. Inertia of Motion
3. Inertia of Direction
But nowadays people consider that there are 2 kinds of inertia , inertia of rest and inertia of motion.
Inertia
Resting Inertia and Moving Inertia
There is no "A inertia." Its just inertia and inertia is the measure of an objects to stay at rest or to keep moving.