The core of earth is formed of NIFE due to which it has strong magnetic field. Then why doesn't any magnetic object above earth sinks below the earth towards the core??
Answers
Answer:
First of all, your question is wrong. Let me first correct your question, and then answer it.
Magnetic field around earth is NOT CAUSED due to its core. I understand your NIFe reference, but here, things are different. we all know that earth's core is super hot, like 6000 degree Celsius!!!! Which is approx equal to suns surface temp!!! Also, the pressure here is approx 3.6 million atmospheres!
At such extreme conditions, metals lose their magnetic properties. So, the core is not the reason for magnetic field.
The real reason behind it is, the lava which flows on it.
To understand how it's exactly produced, u need some physics, which I have mentioned here, if u don't want to read it, simply scroll down, where I have actually answered your question.
OK. So our earth works somewhat like dynamo, just in opposite sense. In a dynamo, u pedal the bicycle, which in turns automatically switch on the light on it. When u pedal, the magnet in the dynamo also turns, which in turn produces electric current (search 'faradays law of electromagnetic induction' for more info).
The opposite is also possible, rotating current produced produces magnetic field.
As a result, when lava flows on earth's core, it produces electric charges due to friction, and bcoz of earth's rotation, we get a magnetic field.
ok now lemme answer yo question.
ANSWER OF YOUR QUESTION:
First of all, most powerful parts of the magnet are it's poles. Also, magnets have lines of magnetic field, along which they basically 'apply force'. Now any magnetic obj will align itself along this line.
there's also an experiment, where u throw iron fillings around a bar magnet, and then on shaking the table a little bit they allign themselves along these line.
(the image of magnetic lines of forces is posted at the beginning of ans)
u can say that the magnetic force acts along these lines, hence, from the diagram, u can see that these lines go from one pole to another, Hence, a magnetic material will attract or deflect from towards the poles, not from the complete magnet. As a result, any magnetic material points towards the poles, not directly towards the core. Hence, a magnetic material doesn't move towards the earth's core. Also, earth's magnetic field is rather weak, if u compare it with other celestial bodies. Finally, a magnet cannot 'sink' below earth (according to your question), as our earth is a solid.
I HOPE THAT YOU ARE SATISFIED WITH MY ANSWER, CAUSE IT TOOK A REALLY LONG TIME TO TYPE ALL THESE.
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THANK YOU.
