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In a circular magnet, the magnetic lines of force emerge and wrap around. The flat faces are the poles of a circular magnet.
Well a thing i want to tell you is that magnetic monopoles do not exist in the nature of magnet, saying it simply that only one north/south pole do not exist. It is true for all the magnets of any shape and size.
May this helps you....
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As a first-order approximation, the Earth's magnetic field can be modelled as a simple dipole tilted about 10° with respect to the Earth's rotation axis and centered at the Earth's centre.
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