I remember reading that an MRI’s magnetic field is more powerful than the earth’s, so shouldn’t my compas’ needle be more attracted by MRIs rather than the magnetic north, and therefore point towards it?
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Imagine a candy store the size of big mall thats Earth and there is a small cart full of candy. Now if a bunch of kids were near the cart and the mall was far away, then yah they would go towards the cart, however any where 50 ft away all the kids will see that big mall size candy shop and gravitate there.
Not so ELI5: magnetism obeys Coulomb’s Law which is inversely proportional to the distance squared (i.e. it obeys an inverse square law with distance) that basically means distance will depreciate the force by the distance square.
BACK to eli5, these kids have bad eye sight for every feet the kids walk away the image would shrink faster then their distance. For example if they walk 2 feet the image shrinks by 4x, 4 feet 16x and so on.
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