Physics
The basic reason for the extraordinary sparkle of suitably cut diamond is that

It has a very high transparency
It has well defined cleavage planes
It has a very high refractive index
It is very hard

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Physics
Circuit breaker usually operate under

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

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