what is magnetism? Can an object increase/decrease in magnetism?
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Magnetism is interesting phenomenon. It is an aspect of the electro-magnetic force. You can change the magetic field of an object. An electro-magnet is one example of this. Allow a current to flow through the coil and you have a magnet. Remove the current and magnetism goes away (for the most part anyways).
Even more interesting is that you change the magnetic field of an object just by running past it. A moving electric charge creates a magnetic field. Let’s put a negative static charge on a ball. Standing next to the ball you will only be able to detect an electric field.
Now suppose someone else drives by the ball in a car. If they had a sensitive enough measurement device, then the guy driving by in a car would detect a magnetic field created by the ball (they’d also sense the electric field). The faster they go the stronger the magnetic field they detect. You, still standing next to the ball when they drive past, will still only be able to measure an electric field–no magnetic field. Fun!
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