Sat December 31, 2011 By:
previous answer was wrong and i have questioned for forces because each electron has equal orbital velocity and spin in identicle atoms.
And forces causes of rotational motion of earth about its axis

What forces causes for spin motion of electron in an atom and rotational motion of earth about its axis? Or causes of spin motion ?

Expert Reply
Mon January 02, 2012
Earth spins because of the way it was formed. Our solar system formed about 4.6 billion years ago when a huge cloud of gas and dust started to collapse under its own gravity. As the cloud collapsed, it started to spin. Some of the material within this cloud gathered into swirling eddies and eventually formed into planets. As the planets formed they kept this spinning motion. This is similar to what you see when skaters pull in their arms and spin fasterie, comes the angular momentum concept. As material gathered in more closely to form a planet, like Earth, the material spun faster. The Earth keeps on spinning because there are no forces acting to stop it.
similarly the same intrinsic property is applicable for electrons is still under research.
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