Find the gravitational force between two protons kept at a separation of 1 femtometre (1 femtometre\[=\text{1}{{0}^{-\text{15}}}\text{ m}\]). The mass of a proton is\[1.67\times {{10}^{-27}}kg\].

• A.  \[1.8\times {{10}^{-42}}N\]                       
• B.  \[1.8\times {{10}^{-29}}N\]
• C.  \[1.8\times {{10}^{-39}}N\]                       
• D.  \[1.86\times {{10}^{-34}}N\]