Register to reply

Proton, electron charge equal

by kye
Tags: charge, electron, equal, proton
Share this thread:
kye
#1
Dec5-13, 01:15 AM
P: 168
Why (or what mathematical reason) is the charge of the electron being -1.60217733 x 10-19 C equal to the charge of the proton but opposite in size? Proton are composed of quarks and electrons don't have anything to do with quarks.
Phys.Org News Partner Physics news on Phys.org
Step lightly: All-optical transistor triggered by single photon promises advances in quantum applications
The unifying framework of symmetry reveals properties of a broad range of physical systems
What time is it in the universe?
Shyan
#2
Dec5-13, 01:47 AM
Shyan's Avatar
P: 859
That's what we see in nature,experimentally, and there is no explanation for it yet,at least non that is proved!
Drakkith
#3
Dec5-13, 02:16 AM
Mentor
Drakkith's Avatar
P: 11,884
There is no underlying reason why fundamental properties exist. They just do. Perhaps our understanding will change in the future.

kye
#4
Dec5-13, 03:13 AM
P: 168
Proton, electron charge equal

There are 3 quarks in a proton. What is the value of each quark such that the composite proton has the value 1.60217733 x 10-19 C? Or how does each of the 3 quarks contribute to this value?
Shyan
#5
Dec5-13, 03:20 AM
Shyan's Avatar
P: 859
Quote Quote by kye View Post
There are 3 quarks in a proton. What is the value of each quark such that the composite proton has the value 1.60217733 x 10-19 C? Or how does each of the 3 quarks contribute to this value?
A proton has 2 up quarks and 1 down quark.Up quarks have electric charge equal to [itex]+\frac{2}{3}e[/itex] and down quarks have electric charge equal to [itex] -\frac{1}{3}e [/itex] where e is the charge on a proton.
kye
#6
Dec5-13, 03:27 AM
P: 168
Quote Quote by Shyan View Post
A proton has 2 up quarks and 1 down quark.Up quarks have electric charge equal to [itex]+\frac{2}{3}e[/itex] and down quarks have electric charge equal to [itex] -\frac{1}{3}e [/itex] where e is the charge on a proton.
It sounds like an up quark is composed of 2/3 of electron and down quark is composed of 1/3 of electron. Won't it sounds like an electron is composed of 3 units. I know we treat it as a point object. But the Landau problem says an electron can't be a point because its electric charge at infinite center would repel each other. So there is still hope an electron can be even composed of smaller objects bound together to form an electron?
Drakkith
#7
Dec5-13, 04:45 AM
Mentor
Drakkith's Avatar
P: 11,884
Quote Quote by kye View Post
It sounds like an up quark is composed of 2/3 of electron and down quark is composed of 1/3 of electron. Won't it sounds like an electron is composed of 3 units. I know we treat it as a point object. But the Landau problem says an electron can't be a point because its electric charge at infinite center would repel each other. So there is still hope an electron can be even composed of smaller objects bound together to form an electron?
Not much hope, no. Electrons are thought to be fundamental particles.
dauto
#8
Dec5-13, 09:54 AM
Thanks
P: 1,948
There is no explanation for that apparent "coincidence" between the charges of the quarks and the electron within the Standard model (except for the highly technical requirement of triangular anomaly canceleation requirements in order to preserve renormalizability). But with GUT theories that "coincidence" is actually a consequence of the symmetries imposed on the theory by the GUT gauge interaction.


Register to reply

Related Discussions
Find a reference frame where momenta of electron and proton are equal Introductory Physics Homework 5
Proton/Electron charge High Energy, Nuclear, Particle Physics 2
Why have electron and proton same magnitude of charge? Classical Physics 11
Electron & proton charges precisely equal General Physics 6
Charge on a electron & proton. Quantum Physics 22