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Dynamo theory suggest how magnetic field generated on Earth. Due to flowing magma which contains molten iron generates magnetic field on earth. But how magnetic field is generated over sun?

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The Sun's interior is partly or completely ionised and therefore supports the flow of electric currents. The solar magnetic field is explained by a solar dynamo that converts the kinetic energy of electrically charged fluid flows in the Sun (due to differential rotation and convection) into electromagnetic energy.

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