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

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

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
Sub-transient state of short-circuit current
Steady state of short-circuit current
After D. C. component has ceased

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