U.S. quarters are made of copper and nickel so they're not magnetic. But you did try to use a magnet on one to find out, of course....
Canadian quarters are made of nickel or steel depending on their age, so they are magnetic.
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Quarters are made of a cupronickel alloy which contains nickel, copper, and manganese. These metals are not magnetic, so quarters are not generally attracted to magnets. However, some older quarters minted with silver may contain trace amounts of magnetic materials.
US quarters are not typically magnetic. Quarters are made of a combination of metals, including copper and nickel, which are not magnetic.
I'm not sure about quarters in particular.I do know that the British 1 and 2 pence coins used to be made of copper, a non-magnetic element. However recently the price of copper rose so much that the 1 and 2 pence cions were worth more than 1 or 2p. To remedy the situation the coins are now made of copper-plated steel. Steel is magnetic, hence the coins are.In short I would guess it is because some quarters are made of magnetic metals like steel and nickel whereas other are not.
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Assuming all quarters are the same weight, and a quarter weighs about 5.67 grams, then 12.6 pounds is roughly 2,291 quarters. 2,291 quarters is equivalent to $572.75.
4400 quarters weigh 275 pounds.