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19>
See,the centripetal force reqd for the electron to move around atom is provided by electrostatic force of attraction.
So,mv2/r=force of attraction.
The force of attraction has been calculated in the prev sum.Use that as F and r is also given and m is mass of electron.Subst. and get the ans.
Enuf for now,rest 2mrw.
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Moderation Team
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