Solve the following questions:
Question I: Two protons in a molecule are 3.90 x 10-10 m apart. Find the electric force exerted by one proton on the other.
Question II: State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other?
Question III: What must be a particle's charge-to-mass ratio if the magnitude of the gravitational force between two of these particles is equal to the magnitude of electric force between them?
I need help to solve the above questions.