Why does our planet have magnetic polarity with two poles?
Emilia AcostaBecause the magnetic field is divergence free,
Magnetic fields are dipolar and produced by currents; they have no monopole or divergence.
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Theodore AngelisBecause of the movement of molten iron and nickel in its outer core, our planet has two poles to its magnetic polarity. The Earth rotates, producing a geodynamo effect that creates a magnetic field with north and south poles that is vital to shielding the planet from solar winds and cosmic radiation.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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