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No. "Magnetic" means that a piece of metal is itself magnetized, so coins are never magnetic. However metals like steel and nickel are attracted to a magnet. But in the case of US coins, most of them contain a high enough concentration of other metals (copper today, silver in the past) that they're not attracted to a magnet.
The only exception to this were the famous 1943 1-cent coins that were made from steel because copper was needed for the war effort.
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Which side of the magnet do you use to magnetized water?
There is no scientific evidence to support the claim that magnets can magnetize water. Magnets can interact with water molecules, but they do not magnetize or make water magnetic.
How do you magnetize a dress maker's pin?
You can magnetize a dress making pin by stroking it in one direction with a permanent magnet. I have done it using a good quality fridge magnet. Dress making pins may become magnetized when they are dropped on a hard surface, for example a tiled floor.
What is a highly magnetize rotating neutron stars I met a beam electromagnetic radiation in the form of radio waves?
A pulsar
How will you magnetize two north poles?
Two north poles will repel each other due to their like magnetic charges. To "magnetize" them together, you would need to flip one of them around so that it becomes a south pole. This will create attraction between the two poles and they will come together due to the magnetic force.
Quantity of silver in pre 1965 silver coins or weight of silver?
It depends on the year the coin was minted. Quarters made since 1965 are copper clad with cupronickel, and weigh 5.67 gm each. Interestingly that's 0.2 US ounces so even though coins are measured in metric units, exactly 5 quarters weigh one US ounce. From the 1870s to 1964, US quarters were made of 90% silver/10% copper and weighed 6.25 gm. A US ounce is 28.35 gm so doing the division works out to about 4.54 coins per ounce.
