Physics
Why the needle of iron swims on water surface when it is kept gently ?

Due to its shape
It will remain under the water, when it will displace more water than its weight
The density of needle is less than that of water
Due to surface tension

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Physics
In the process of magnetisation of a bar

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

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