Compare the strength of the electric force to that of the gravitational force as suggested in Section 12.3. In particular, find the ratio of the Coulomb force of repulsion between two protons separated by 10^-15 m to their gravitational force of attraction for the same distance. The mass and charge of the proton are given in Table 11.1.

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Charge Particle Mass 9.109 X 10-31 kg = 0.00055 u 1.67262 × 10-27 kg = 1.00730 u 1.67493 X 10-27 kg -1.602 × 10-19 C Electron 1.602 X 10-19 C Proton 1.00869 u Neutron