What? You want to say that when I am taking a magnet and lift in the air some iron needles, the needles already had some magnetic field of their own?But this means that target object must have own magnetic field in order to interact with field you create externally.
Firstly, I know four forces in the nature. Gravity, electromagnetic and nuclear. I dont know that "attractive force" of yours.no, that is attractive force.
it was never specified that objects to be lifted are ferromagnetic and if lift has to be gentle or if it is ok to result in collision.
btw. if those needles never develop their own magnetic field (such as induced magnetic field), you will not be able to pick them with a magnet. there... ;p
You said that a field has to exist in order for the object to interact and I am saying that this is not correct."target must have field to interact" so what?
where does it say that own field has to exist before object is excited?
you may want to recount those four forces.
Electric force and magnetic forces can be combined to make electromagnetic, but they also exist separately.Firstly, I know four forces in the nature. Gravity, electromagnetic and nuclear. I dont know that "attractive force" of yours.
Secondly, you said "that target object must have own magnetic field in order to interact with field you create externally". If you take two metals and bring them together, will you observe any magnetic interaction? No. But if you bring them close to a magnet and then force an interaction between them, will you see any difference? Yes, because now their magnetic domains are not messed up.
So, the needles didnt have any magnetic field, they got it after the interaction with the magnet.
Actually, when I said electromagnetic I meant the force an electric field and a magnetic field can cause, but since they are closely related to each other I simply mentioned them as electromagnetic force.Electric force and magnetic forces can be combined to make electromagnetic, but they also exist separately.
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