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Photon does not have charge then how does it have electromagnetic field?
Well one way to look at it is that a photon IS an electromagnetic field. The photon is the gauge particle for the electromagnetic force. Without photons there would be no electromagnetic interaction force, and therefore no electromagnetic fields.
A gamma ray is a very high speed particle with no charge?
Sort of. A gamma ray is a photon, which is a particle/wave moving at the speed of light, because it is light.Photons are the gauge particles for the electromagnetic force, but they don't carry an electric charge themselves.
What is the force that holds atoms together called?
The question is ambiguous.The primary force between distinct atoms that holds them together is the electromagnetic force (there's also gravity, but that's much much weaker). The communicating particle (aka "gauge particle") for the electromagnetic force is the photon.Several forces play a part in holding an individual atom together. Electrons are bound to the nucleus by the electromagnetic force. The individual nucleons (protons and neutrons) are composed of quarks held together by the strong nuclear (or "color") force, and the nucleons are bound together in the nucleus by the residual strong nuclear force. The gauge particle for the strong force is known as the gluon.
What are gauge bosons?
Gauge bosons are elementary particles (subatomic particles). An elementary particle is a substance that can not be broken down anymore. So to answer your question: Gauge bosons are the forces of what makes up nature. For example: Photon=electromagnetic force, gluon=strength, z and w bosons=weakness and gravitons=gravity (not yet observed). The different particles can be found on the Elementary particle table. I hope this partially answers your question.
Is a photon a particle of light?
It's the basic unit of light and other forms of electromagnetic radiation. If you're asking if it's "light" in the weight sense, yes. It has a rest mass of zero; you can't get lighter than that.
Can charged bodies exert forces even at a distance?
Yes. The gauge particles for the electromagnetic force are (massless) photons, so there's no distance limit to electromagnetic interactions.
How are the four fundamental forces similar?
This question is not that easy to answer. The problem is that one of the fundamental forces (gravity) has not yet been successfully merged into the theoretical framework used to describe the other forces. The other three forces have the following similarities: -They are all mediated by particles of force called gauge bosons. -They can all be thought of arising from symmetries of the laws of nature. -The gauge bosons of these forces all have spin-1. The electromagnetic force and the weak nuclear force are the low-energy result of one underlying force called the electroweak force. Gravity, if successfully added would also be mediated by a gauge boson called the graviton, although it will have spin-2. It is also associated with a symmetry; that the laws of physics do not depend on the observer's frame. Mathematically it would be associated with local SO(3,1) (Lorentz group) invariance.
Which is the lightest particle of an atom?
Of the particles usually given as components of the atom... the electron, the neutron, and the proton... the electron is by far the lightest. If you want a simple answer, stop there; the rest of this gets nitpicky. Under the standard model, the neutrons and protons are themselves composed of smaller particles called quarks (all of which are still more massive than electrons). However, since quarks have a color charge, they interact with each other through the color force, which is mediated by gauge particles called gluons. There's also an electrical force between the charged particles, and the gauge particle for the electromagnetic force is the photon. Both gluons and photons are massless, so they're tied for the title of "lightest particle". (It's currently believed that if they exist gravitons must also be massless, making it a three-way tie. The fourth fundamental force... the weak nuclear force... is mediated by the very massive W and Z bosons, which aren't in the running.)
What force of nature acts over the longest distance?
Both gravity and the electromagnetic force have infinite range. The color force is limited by its own strength (objects with color charge separated by more than a tiny distance create enough potential energy that it's more energetically favorable to just create a new particle), and the weak force is limited by the mass of its gauge particles to a very small range.
Do photons conduct electricity?
No. Electricity is the movement of electrons, and photons have no electrons to move. Photons are the gauge particles for the electromagnetic force, but that's a different concept.
Is it true that charged objects don't have to be touching to interact with other charged objects?
Yes, it's true. They interact via gauge particles called photons, which are the force carriers for the electromagnetic force.
What is a Z boson?
A Z boson is fundamental particle - a gauge boson which, together with the W boson, mediates the weak nuclear force. It has a charge of 0.
