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# Momentum transfer in Electromagnetic Force

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1. Is this correct? Momentum is transferred between two protons by the aid of a virtual photon and this causes repulsion between like charged particles. This is because when a virtual particle leaves one species it changes its momentum and causes it to recoil and does the same when the other specie receives the photon, hence they move apart. However, how does this analogy work for attracting species :s because we have a same virtual photon exchange. How would this attract instead of repel them :s And by momentum transfer could it be possible to say energy is gained and lost :s. Also when two particles interact we get newtons third law kicking in, but would it just be one force here? because two like charge particle don't actually touch. Thanks in advance.
Is this correct? Momentum is transferred between two protons by the aid of a virtual photon and this causes repulsion between like charged particles. This is because when a virtual particle leaves one species it changes its momentum and causes it to recoil and does the same when the other specie receives the photon, hence they move apart. However, how does this analogy work for attracting species :s because we have a same virtual photon exchange. How would this attract instead of repel them :s And by momentum transfer could it be possible to say energy is gained and lost :s. Also when two particles interact we get newtons third law kicking in, but would it just be one force here? because two like charge particle don't actually touch. Thanks in advance.
repelling: the photon is like a ball
attracting: the photon is like a boomerang
3. (Original post by Kyx)
repelling: the photon is like a ball
attracting: the photon is like a boomerang
but can we say that in an exam
but can we say that in an exam
Not really, it's an analogy
You just have to say that the photon carries the force. that's it
5. (Original post by Kyx)
Not really, it's an analogy
You just have to say that the photon carries the force. that's it
oh phew XD. so only question they can ask, what is carrier of the EM force :P. i was stressing myslef lol
oh phew XD. so only question they can ask, what is carrier of the EM force :P. i was stressing myslef lol
Yes
and how does it differ from the carriers of the other forces
7. (Original post by Kyx)
Yes
and how does it differ from the carriers of the other forces
zero rest energy, non charged, and infinite range :P
zero rest energy, non charged, and infinite range :P
yup

And they are 'massless'. Which is also why they have infinite range.
9. (Original post by Kyx)
yup

And they are 'massless'. Which is also why they have infinite range.
yay thanks :P
yay thanks :P
np

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