Radioactive decay can't be controlled by an electric field - or by almost anything, for that matter.
It is quicker and can be done in the field for a quick age referencing of a rock sample.
No, the electric field oscillates in magnitude and direction as it propagates in the electromagnetic wave.
William Graham Greenwood has written: 'Decay of atomic states strongly coupled by an oscillating field' -- subject(s): Radioactive decay
If the electric field is zero, the electric potential is a constant value, but it does not tell you what that value is. All the electric field tells you is how the electric potential changes within the region you are looking at. If the electric potential at one end of a cylindrical region is 7 V and the electric field is zero within the whole cylinder, then the electric potential is 7 V at the other end, or somewhere in the middle, or on the side, and so forth. An electric field of zero tells you the potential does not change, but doesn't say anything about what it is outside of the region you're looking at.
The magnetic force acts only on moving electric charges; A constant electric current produces an unchanging magnetic field and a changing electric current produces a changing magnetic field.
E = Eo/k k is dielectric constant
Ernest Rutherford, however it was Arthur Holmes who did the majority of the in depth work in this field.
Charged particles will be deflected by an electric field. The movement of any charged particle through an electric field will cause that charged particle to be attracted by one pole of the field and repelled by the other. That leaves uncharged particulate radiation, like a neutron, and electromagnetic radiation that will not be deflected by an electric field. The electromagnetic radiation will include X-rays and gamma rays.
For all practical purposes, No. However, there is a very small effect on some elements due to pressure (E.g. http://www.sciencemag.org/cgi/content/abstract/181/4105/1164), there is a small effect upon Beta Decay due to magnetic field strength, and there is an effect due to ionization.
either is constant
Yes, but only for nuclides that decay by beta+ decay dependent on electron capture or internal conversion. This is because the strong electric field can change the ionization state of the nuclide, removing inner shell electrons or freeing up inner shell levels. Examples are beryllium-7 and rhenium-187; there are others.
A uniform electric field has symmetrical and constant field effect throughout the region is permeates. Or in easier language, the test charge should encounter constant force through out the region when the electric field is uniform or constant. So, according to your query the uniform field is there, where the effect of the uniform is constant.