Imagine you have a wire with stationary positrons and moving electrons, you then throw an apple,full of protons,you would expect the apple to stay stationary but you notice it being repelled by a force, the force seems to be dependant on the speed and direction of the apple, by moving electrical charges, this force spawns. That’s what a magnetic force is and that’s basically magnetism in a nutshell. And yes, you can decrease/increase the magnetic influence. That’s (kinda) how magnets work.
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