Physics · PYQ NEET UG 2017

Suppose the charge of a proton and an electron differ slightly. One of them is \( -e \), the other is \( (e + \Delta e) \). 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 \( \Delta e \) is of the order of [Given mass of hydrogen \( m_h = 1.67 \times 10^{-27}\text{ kg} \)]

1. A
   \( 10^{-23}\text{ C} \)
2. B
   \( 10^{-37}\text{ C} \)
3. C
   \( 10^{-47}\text{ C} \)
4. D
   \( 10^{-20}\text{ C} \)