NEET 2003 Physics question

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius . The coulomb force between the two is -

(1)
(2)
(3)
(4) (where )Correct

Answer: (4)

Solution

The force between the proton and the electron is attractive, so on the electron (position vector measured from the nucleus) it points opposite to . Its magnitude is . $ = -K =

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Question ID VK-089159