Mass-to-charge ratio used as its unit in the field of mass spectrometry. Some fields use the charge-to-mass ratio ("Q"/"m") instead, which is the multiplicative inverse of the mass-to-charge ratio. The 2014 CODATA recommended value for an electron is = . When charged particles move in electric and magnetic fields the following two laws apply: where F is the force applied to the ion, "m" is the mass of the particle, a is the acceleration, "Q" is the electric charge, E is the electric field, and v × B is the cross product of the ion's velocity and the magnetic flux density. This
John (given name) masculine name in the United Kingdom, but by 2004 it had fallen out of the top 50 names for newborn boys in England and Wales. By contrast Jack, which was a nickname for John but is now established as a name in its own right, was the most popular name given to newborn boys in England and Wales every year from 1995 to 2005. However, "John" has not been a popular one for members of the royal family. The memory of King John is tainted by negative depictions of his turbulent reign and troublesome personality and by his role as