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Ratio of electrostatic to gravitational force between two particles

This type of question, asked 2 times: 5 Apr 2024, 23 Jan 2025. All 2 questions below, oldest first.

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  1. Question 1

    5 Apr 2024

    7
    In hydrogen like system the ratio of coulombian force and gravitational force between an electron and a proton is in the order of:

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  2. Question 2

    23 Jan 2025

    21
    A positive ion AA and a negative ion BB has charges 6.67×10−19C6.67 \times10^{- 19}C and 9.6×10−10C9.6 \times10^{- 10}C, and masses 19.2×10−27 kg19.2 \times10^{- 27}\text{ }kg and 9×10−27 kg9 \times10^{- 27}\text{ }kg respectively. At an instant, the ions are separated by a certain distance r. At that instant the ratio of the magnitudes of electrostatic force to gravitational force is P×1044P \times10^{44}, where the value of P is  ______\ \_\_\_\_\_\_ . (Take 14πε0=9×109Nm2C−2\frac{1}{4\pi\varepsilon_{0}}= 9 \times10^{9}Nm^{2}C^{- 2} and universal gravitational constant as 6.67×10−11Nm2 kg−26.67 \times10^{- 11}Nm^{2}{\text{ }kg}^{- 2} )