The normal current carrying capacity is 6 amps per square millimeter without any cooling with forced cooling the number can be as high as 30 amps per square millimeter and for a motor application this means 5 times the energy density so a typical 1 or 2 KW/Kg energy density is now 5 to 10 KW/Kg in a continuous operation and peak values can be 10 times for a min or 20 times for a few seconds. The limiting factor is the thermal effects and how you deal with them the more efficient the heat removal the higher the allowed level of current.
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The answer depends on the cross sectional area of the wire. This is not given.
Current US quarters are made of a "sandwich" consisting of a pure copper core clad on both sides with a layer of cupronickel alloy (25% nickel and 75% copper). Overall, copper makes up about 92% of the coin by weight. Current Canadian quarters are made of an alloy of 94% steel and 3% copper, plated with nickel.
The current clad version is two layers of copper/nickel (75% Copper, 25% Nickel) on a core of pure copper giving a total composition of 8.33% Ni with the remainder Cu.
Current Canadian dimes are made of steel. Before that they were made of nickel, and up till 1967/68 they were made of various alloys of silver and copper. Current US dimes are made of a metal "sandwich" consisting of outer layers of 75% nickel and 25% copper bonded to a core of pure copper. Up till 1964 US dimes were made of 90% silver and 10% copper.