# Test Particle

In physical theories, a test particle is an idealized model of an object whose physical properties (usually mass, charge, or size) are assumed to be negligible except for the property being studied, which is considered to be insufficient to alter the behavior of the rest of the system. The concept of a test particle often simplifies problems, and can provide a good approximation for physical phenomena. In addition to its uses in the simplification of the dynamics of a system in particular limits, it is also used as a diagnostic in computer simulations of physical processes.

### Other articles related to "test particle, particle":

Scalar–tensor–vector Gravity - Spherically Symmetric, Static Vacuum Solution
... First a test particle Lagrangian is postulated in the form where is the test particle mass, is a factor representing the nonlinearity of the theory, is the test particle's fifth-force charge, and is its four-velocity ...
Gravitational Field - Classical Mechanics
... Determined in this way, the gravitational field g around a single particle of mass M is a vector field consisting at every point of a vector pointing ... the gravitational force, m is the mass of the test particle, R is the position of the test particle, is a unit vector in the direction of R, t is time, G is the gravitational constant, and ∇ is the del ... equations are differential equations of motion for a test particle in the presence of a gravitational field, i.e ...

### Famous quotes containing the words particle and/or test:

Love is life. All, everything that I understand, I understand only because I love. Everything is, everything exists, only because I love. Everything is united by it alone. Love is God, and to die means that I, a particle of love, shall return to the general and eternal source.
Leo Tolstoy (1828–1910)

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
F. Scott Fitzgerald (1896–1940)