Photons has electric&magnetic fields.still they don't show a little repulsion or attraction?

Question

what mechanism make them to move with velocity 'c'?

Answer 1

This is not an easy concept to understand.  Infact many scientists today still have qualms about 'photons' and 'electromagnetic radiation'.

The way I see it, better to call it a "Bundle Of Energy".  Now this energy, can show either characteristic at one time, but NEVER both characteristics at the SAME time.

When you try and investigate this 'Bundle Of Energy' in a certain way, say the photoelectric effect - then this 'Bundle Of Energy' appears show particle like characteristics, which scientists then called Photon.

However, when you try and investigate it in another way, say in diffraction and refraction, then this 'Bundle Of Energy' shows characteristics of waves, and when further assessed, the waves were of Electric and Magnetic characteristics (E-M radiation).

Note that they show CHARACTERISTICS of electricity/magnetism only.  That's not to say that they ARE electricity, or magnetic.  That's why they don't repel each other or attract each other.

As for their velocity, you have to look into Electro-magnetic INDUCTION and E-M field theory.  This 'Bundle Of Energy', if you think of it as an E-M wave, travels like so.  Usually the changing E field induces a change in B (magnetic) field, which inturns induces another change in E field further along the path.  The speed of induction from E to B field and back to E... and so on has been measured to be the speed 'c'.  

Yes it sounds very convoluted.. that is why many scientists are still confused about the matter.  Hope it helped in someway.