Find the gravitational force of attraction between two protons kept at a separation of 1 femtometre ( 1 femtometre = 10^-15 m ). The mass of a proton is 1.67×10^-27kg (approx)
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Answer:
F=GM/R^2.
=6.67×10^-11×1.67×10^-27/10^-15×10^-15
=11.1×10^-8
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