Question

Suppose the charge of a proton and an electron differ slightly. One of them is -e, the other is . If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then is of the order of [Given mass of hydrogen ]

A

B

C

D

Medium

Solution

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Correct option is D)

Given : 
Net charge on hydrogen atom  
Let the distance between them be .
Equating gravitational force and the electrostatic force, we get

Or  

The correct answer is option D.

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