Physics
When a running car stops suddenly, the passengers tends to lean forward because of:

Inertia of rest
Gravitational force
Inertia of motion
Centrifugal force

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Physics
In the process of magnetisation of a bar

Only some parts of the outer layers of the bar get magnetised
The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised

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