Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals have higher thermal capacity than plastics
plastics have a lower density than metals
metals are good conductor of heat
plastics have a higher thermal conductivity than metals

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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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