| In many ways, however, the weak force resembles the electromagnetic force. |
| But the gluons are unlike the carrier particles of the electromagnetic force which appeared along with the virtual electrons and positrons. |
| This resonance was due to a delicate balance between the strong nuclear force and the repulsive electromagnetic force in samarium. |
| A theory that unifies the electromagnetic force with the weak nuclear force was developed around 1970 by Glashow, Salaam, and Weinberg. |
| Quarks and charged leptons also feel the electromagnetic force, and quarks feel the strong force. |
| For example, the electromagnetic force between a proton and an electron is 10 times stronger than the gravitational force. |
