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Encyclopedia > Charge invariance

Charge invariance refers to the fixed electric charge of a particle, regardless of speed. For example, an electron has a specific charge at rest. At a velocity v, the charge remains the same (as opposed to the energy increasing). Some particle characteristics are relativisticly invariant (electric charge and rest mass). Others, like energy, change with velocity. Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. ... e- redirects here. ... The invariant mass or intrinsic mass or proper mass or rest mass or just mass is a measurement or calculation of the mass of an object that is the same for all frames of reference. ...

Typically, we write:

where the subscript v represent the quantity at speed v. The key factor is:

which is a function of speed relative to rest frame. The first equation above describes relativistic energy, the second – invariant mass (or rest mass), the third – charge invariance. Notice that γ does not appear in the second and third lines. Notice also that as v (speed) increases, γ increases, and so E increases too. The invariant mass or intrinsic mass or proper mass or rest mass or just mass is a measurement or calculation of the mass of an object that is the same for all frames of reference. ...

The property of charge invariance follows from the vanishing divergence of the charge-current four-vector , with . In relativity, a four-vector is a vector in a four-dimensional real vector space, whose components transform like the space and time coordinates (ct, x, y, z) under spatial rotations and boosts (a change by a constant velocity to another inertial reference frame). ...

Results from FactBites:

 Electric charge - Wikipedia, the free encyclopedia (1078 words) The interaction between a moving charge and the electromagnetic field is the source of the electromagnetic force, which is one of the four fundamental forces. Electric charge is a characteristic of some subatomic particles, and is quantized when expressed as a multiple of the so-called elementary charge e, electrons that have a charge of −1. The electric charge of a macroscopic object is the sum of the electric charges of its constituent particles.
 Theory: Charge Conjugation Invariance (340 words) Charge conjugation invariance states that the rate of a process is identical to the rate of a similar process with all particles replaced by their antiparticles Charge conjugation invariance is true for strong and electromagnetic interactions This CP invariance violation was observed in K decays.
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