NEET 2017 Physics question
Suppose the charge of a proton and an electron differ slightly. One of them is , the other is . If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance (much greater than atomic size) apart is zero, then is of the order of [Given mass of hydrogen ]
Answer: (3)
Solution
Each hydrogen atom has one proton and one electron, so its net charge is . The electrostatic repulsion between two such atoms must balance their gravitational attraction: . $ = ⇒ (Δ =
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