Physics
Circuit breaker usually operate under

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

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Physics
Ice is packed in saw dust because

Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.

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